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A child car seat comprises a seat body including a seat wall and a backrest wall, and a V-shaped shield structure extending from above both shoulders to a crotch of a child. The V-shaped shield structure includes a belt extending in the shape of the letter V, a belt guiding member guiding the belt a

A child car seat comprises a seat body including a seat wall and a backrest wall, and a V-shaped shield structure extending from above both shoulders to a crotch of a child. The V-shaped shield structure includes a belt extending in the shape of the letter V, a belt guiding member guiding the belt and an elastic cover surrounding the belt guiding member.

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1. A child car seat adapted to have a child seated therein, said child car seat comprising:a seat body including a seat wall and a backrest wall; and a V-shaped shield structure configured and arranged so as to be adapted to extend downwardly from above bath shoulders of the child so as to restrain

1. A child car seat adapted to have a child seated therein, said child car seat comprising:a seat body including a seat wall and a backrest wall; and a V-shaped shield structure configured and arranged so as to be adapted to extend downwardly from above bath shoulders of the child so as to restrain a body of the a child when the child is seated in said seat body; wherein said V-shaped shield structure includes a belt extending in the shape of the letter V, a belt guiding member guiding said belt, and an elastic cover surrounding said belt guiding member. 2. The child car seat according to claim 1, wherein said V-shaped shield structure is configured and arranged so as to be adapted to extend down to a crotch of the child when the child is seated in said seat body.3. The child car seat according to claim 2, wherein said V-shaped shield structure includes a back surface abutting part which is kept connected to said backrest wall of said seat body and a neat surface abutting part which can be separated from said seat wall, and further comprising a buckle detachably connecting said seat surface abutting part of said V-shaped shield structure to said seat wall of said seat body.4. The child car seat according to claim 1, wherein said elastic cover includes a shoulder protector part configured and arranged so as to be adapted to extend in an almost horizontal direction over both shoulders of the child when the child is seated in said seat body.5. The child car seat according to claim 1, wherein said elastic cover includes a pair of side projections configured and arranged so as to be adapted to project toward a waist part of the child when the child is seated in said seat body.6. The child car seat according to claim 1, wherein said elastic cover has a concave portion located so as to be adapted to be adjacent to a genital zone of the child when the child is seated in said seat body.7. The child car seat according to claim 1, wherein said elastic cover is formed of bead foam.8. The child car seat according to claim 1, wherein said belt guiding member is formed of blow-molded resin.9. The child car seat according to claim 1,further comprising a frame assembly supporting said seat body, wherein said frame assembly includes a pair of L-shaped frames extending along both sides of said backrest wall and said seat wall of said seat body, an upper connection rod connecting upper portions of said pair of L-shaped frames with one another, and a lower connection rod connecting lower portions of said pair of L-shaped frames with one another, and wherein said belt extending in the shape of the letter V winds around said upper connection rod and is connected to said lower connection rod. 10. The child car seat according to claim 1, further comprisinga crotch pad upwardly extending from said seat wall of said seat body to a position adapted to be adjacent to a crotch of the child when the child is seated in said seat body, and a buckle detachably connecting a lower end of said V-shaped shield structure to said crotch pad. 11. The child car seat according to claim 10, wherein said crotch pad includes a pair of side projections configured and arranged so as to be adapted to project toward a waist part of the child when the child is seated in said seat body.12. The child car seat according to claim 10, further comprising a connecting device detachably connecting said crotch pad to said seat wall of said seat body.13. The child car seat according to claim 10, further adapted to be arranged in a car, wherein said crotch pad comprises, on a front surface thereof, a shoulder belt guide device adapted to guide a shoulder belt mounted on the car when said car seat is arranged in the car.14. The child car seat according to claim 1, further comprisinga crotch belt upwardly extending from said seat wall of said seat body to a position adapted to be adjacent to a crotch of the child when the child is seated in said seat body, and a buckle detachably connecting a lower end of said V-shaped shield structure to said crotch belt. 15. The child car seat according to claim 1, further comprisinga belt connected to said V-shaped shield structure, passing a back surface of said backrest wall and said seat wall of said seat body, and drawn out to a front end of said seat wall, and a lock member that is provided at said front end of said seat wall, and that selectively prohibits movement of said belt. 16. The child car seat according to claim 1, wherein said V-shaped shield structure is rotatably connected to said seat body so as to be able to be displaced between a closed position and an opened position, and said child car seat further comprises an elastic member which always urges said V-shaped shield structure toward said opened position.17. A child car seat adapted to have a child seated therein, said child car seat comprising:a seat body including a seat wall and a backrest wall; and a V-shaped shield structure configured and arranged so as to be adapted to extend downwardly from above both shoulders of the child so as to restrain a body of the child when the child is seated in said seat body; wherein said seat body further includes a pair of side walls forwardly extending from both sides of said backrest wall, each one of said side walls has a notch at a forward portion thereof and an opening at a backward portion thereof, and said child car seat is adapted to be arranged in a car such that a seat belt mounted on the car passes through said notch or said opening. 18. The child car seat according to claim 17, further comprising a frame assembly supporting said seat body, wherein:said frame assembly includes a pair of L-shaped frames that extend along both sides of said backrest wall and said seat wall of said seat body and that each includes a vertically extending part and a horizontally extending part, and upper and lower reinforcement frames connecting said vertically extending part to said horizontally extending part of each said L-shaped frame, said upper reinforcement frame supports a belt supporting surface provided in said notch of each said side wall from beneath, and said lower reinforcement frame supports a belt supporting surface provided in said opening of each said side wall from beneath.