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Provided is an instrument housing case, which is capable of preventing an instrument from falling down, and which is capable of achieving a reduction in weight. The instrument housing case (10) houses an instrument long in one direction, and includes: a main body case (20) which is defined by an upp

Provided is an instrument housing case, which is capable of preventing an instrument from falling down, and which is capable of achieving a reduction in weight. The instrument housing case (10) houses an instrument long in one direction, and includes: a main body case (20) which is defined by an upper surface (21) and a lower surface (22) each having a larger width, and both side surfaces (23 and 24) each having a smaller width and both end surfaces (25 and 26) closing, to thereby form a cylindrical shape as a whole, the main body case including an opening portion (27) cut out a portion ranging from a middle portion in a longitudinal direction of the upper surface (21) through a middle portion in a longitudinal direction of each of the both side surfaces (23 and 24) to a vicinity of one end surface (25); and a cover body (30) which forms a shape adapted for the opening portion (27) of the main body case (20) and which is pivotably fixed through a hinge (40) to an edge portion of the opening portion (27) in the upper surface (21) of the main body case (20), the edge portion being away from the end surface (25).

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1. An instrument housing case for housing an instrument which is longer in a first direction as compared to a second direction, the instrument housing case comprising: a main body having an upper surface, a lower surface, two side surfaces and two end surfaces, wherein the upper surface and the lowe

1. An instrument housing case for housing an instrument which is longer in a first direction as compared to a second direction, the instrument housing case comprising: a main body having an upper surface, a lower surface, two side surfaces and two end surfaces, wherein the upper surface and the lower surface each have a width larger than a width of the two side surfaces;the two end surfaces each contact the upper surface, the lower surface and the two side surfaces; andthe main body includes an opening ranging from a location at approximately the middle of the upper surface in a longitudinal direction to a location adjacent to one of the end surfaces, and includes a portion of the two side surfaces; anda cover body shaped to close the opening of the main body and pivotably fixed to an edge portion of the opening in the upper surface of the main body, wherein the edge portion to which the cover body is fixed is at a location closer to a center of the main body than to either of the two end surfaces. 2. An instrument housing case according to claim 1, wherein the instrument housing case is formed of a resin reinforced with woven fabric containing carbon fiber. 3. An instrument housing case according to claim 1, wherein: the opening is defined by: edge portions extending along a width direction of the upper surface at a location at approximately half the length of the instrument housing case in the longitudinal direction and a location adjacent to one of the two end surfaces of the main body;edge portions extending along the longitudinal direction of the instrument housing case in the two side surfaces of the main body at locations that are approximately half the width of the two side surfaces; andobliquely inclined edge portions linking the ends of the edge portions extending in the width direction of the upper surface with the ends of the edge portions extending in the longitudinal direction of the two side surfaces;wherein each of the obliquely inclined edge portions is inclined toward a center of each of the edge portions extending in the longitudinal direction of the instrument housing case. 4. An instrument housing case according to claim 1, further comprising: a grip handle provided in a center portion of a side surface of the main body so as to be gripped for carrying the instrument housing case in a laid posture; anda shoulder strap for carrying the main body on the back of a user in a state in which a longitudinal direction of the main body is oriented in a substantially vertical direction, the shoulder strap comprising two ends that are either fixed to two portions of the main body that are located away from each other in the longitudinal direction, or fixed to a portion of the main body and a portion of the cover body that are located away from each other in the longitudinal direction. 5. An instrument housing case according to claim 1, wherein protection layers formed of an elastic resin are formed in corner portions of the end surfaces in the longitudinal direction of the main body. 6. An instrument housing case according to claim 1, wherein the upper surface is integral with the two side surfaces. 7. An instrument housing case for housing an instrument which is long in one direction, the instrument housing case comprising: a main body which is defined by an upper surface, a lower surface, two side surfaces and two end surfaces, wherein the upper surface and the lower surface each have a width larger than a width of the two side surfaces, and the two end surfaces close the main body to thereby form a cylindrical shape as a whole, the main body comprising an opening portion cut out from a portion of the upper surface, the opening portion ranging from a middle portion of the upper surface in a longitudinal direction through a middle portion of the two side surfaces in a longitudinal direction to a vicinity of one of the end surfaces; anda cover body which forms a shape adapted for the opening portion of the main body and which is pivotably fixed through a hinge to an edge portion of the opening portion in the upper surface of the main body, the edge portion being away from the one of the end surfaces, wherein:an instrument capable of being housed in the instrument housing case includes a rubbed string instrument comprising: a main body portion;a neck extending from the main body portion;a bridge portion arranged on a front side of the main body portion;a string tensioned through the bridge portion on the front side of the main body portion and on a front side of the neck; anda chinrest fixed with an end pin to an end portion of the main body portion on a side opposite to the neck; andthe instrument housing case further comprises:a first retaining portion for supporting a vicinity of the end pin provided in an inner periphery of one of the two end surfaces of the main body which is away from the opening portion;a second retaining portion for sandwiching the neck provided on an inner surface of the main body, which is opposed to the cover body, and on an inner surface of the cover body; andan area for holding a painted surface of the instrument is held in contact with an inner surface of the instrument housing case, wherein the painted surface in contact with the inner surface is set to be 10% or less of an entire painted surface of the instrument. 8. An instrument housing case according to claim 7, wherein: the second retaining portion comprises: a first holding member, which is fixed on the inner surface of the cover body, and holds a back surface side of the neck of the instrument; anda second holding member, which is fixed on the inner surface of the main body, and with which a fingerboard provided on the front side of the neck of the instrument comes into contact;wherein, the fingerboard is supported substantially parallel to the inner surface of the main body. 9. An instrument housing case according to claim 7, wherein: the second retaining portion comprises: a first holding member, which is fixed on the inner surface of the cover body, and holds a front surface side of the neck of the instrument; anda second holding member, which is fixed on the inner surface of the main body, and supports a back surface side of the neck of the instrument;wherein, the front surface side of the neck of the instrument is arranged on a side of the opening portion of the main body. 10. An instrument housing case according to claim 8, wherein, at a location between the first retaining portion and the second retaining portion in the inner surface of the main body, which is opposed to the cover body, there is provided a recessed portion for arranging the bridge portion of the rubbed string instrument while preventing the bridge portion from coming into contact with the inner surface of the instrument housing case. 11. An instrument housing case according to claim 7, wherein, in a vicinity of the end surface having the first retaining portion, on an inner side of the lower surface of the main body, which is away from the opening portion, there is provided an inclined surface that gradually increases in height toward the end surface and the first retaining portion. 12. An instrument housing case according to claim 8, wherein the first holding member is structured so as to come into contact with an edge portion of the main body portion of the instrument, which is on a side opposite to the end pin, from a back surface side of the instrument when the cover body is closed, to thereby hold the main body portion against the first retaining portion. 13. An instrument housing case for housing an instrument which is long in one direction, the instrument housing case comprising: a main body which is defined by an upper surface, a lower surface, two side surfaces and two end surfaces, wherein the upper surface and the lower surface each have a width larger than a width of the two side surfaces, and the two end surfaces close the main body to thereby form a cylindrical shape as a whole, the main body comprising an opening portion cut out from a portion of the upper surface, the opening portion ranging from a middle portion of the upper surface in a longitudinal direction through a middle portion of the two side surfaces in a longitudinal direction to a vicinity of one of the end surfaces; anda cover body which forms a shape adapted for the opening portion of the main body and which is pivotably fixed through a hinge to an edge portion of the opening portion in the upper surface of the main body, the edge portion being away from the one of the end surfaces, wherein:bow-retaining portions are provided on both sides of the inner surface of the main body, at locations opposed to the cover body; whereineach of the bow-retaining portions comprises: a guide wall portion for regulating both side positions of a bow; anda fixture for detachably fixing the bow to the inner surface; andat least one of the guide wall portions comprises a cavity therein so as to house components therein.