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An angle drill includes a housing that accommodates a motor. The angle drill also includes a handle that is adapted to be held by an operator during a drilling operation. The handle is coupled to the housing such that the handle can rotate relative to the housing.

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1. An angle drill comprising:a housing arranged and constructed to accommodate a motor;a handle arranged and constructed to be held by an operator, wherein the handle includes handle halves;a coupling device arranged and constructed to couple the handle to the housing, so that the handle can rotate

1. An angle drill comprising:a housing arranged and constructed to accommodate a motor;a handle arranged and constructed to be held by an operator, wherein the handle includes handle halves;a coupling device arranged and constructed to couple the handle to the housing, so that the handle can rotate relative to the housing; anda lock device arranged and constructed to selectively lock and unlock the handle relative to the housing with regard to the rotational direction, wherein the lock device includes a lock button and a support shaft that supports that lock button, the support shaft is rotatably mounted to a boss portion extending across the handle halves, and the boss portion is arranged and constructed to receive screws thereon for tightening the handle halves. 2. An angle drill comprising:a tubular motor housing having an axis;a handle coupled to the motor housing, so that the handle can rotate about the same axis as the axis of the motor housing; wherein the handle includes handle halves;a switch lever mounted on a rear portion of the handle; anda lock device disposed between the motor housing and the handle and arranged and constructed to prevent and permit the rotation of the handle relative to the motor housing;the lock device including a lock button, a plurality of engaging portions, and a support shaft, wherein the support shaft is rotatably mounted to a boss portion extending across the handle halves, the boss portion is arranged and constructed to receive screws for tightening the handle halves;the lock button being disposed in a position adjacent to the switch lever and having an end portion biased toward inside of the handle;the engaging portions being provided on the motor housing and arranged along a moving path of the end portion of the lock button during the rotation of the handle relative to the motor housing;the end portion of the lock button being engageable with the engaging portions, so that the handle can be locked in a position in the rotational direction by selectively engaging the end portion of the lock button with one of the engaging portions. 3. An angle drill as in claim 1, wherein the lock device can lock the handle at a plurality of lock positions that are displaced from each other in the rotational direction. 4. An angle drill as in claim 3, wherein the lock button is mounted on one of the housing and the handle and a plurality of engaging recesses formed in the other of the housing and the handle, the engaging recesses, being spaced from each other in the rotational direction, so that the lock button can engage either one of the engaging recesses for locking the handle with regard to the rotation. 5. An angle drill as in claim 4, wherein the boss portion extends along an axis that is substantially perpendicular to the rotational axis of the handle. 6. An angle drill as in claim 5, further including a biasing member that biases the lock button in a direction toward the engaging recesses. 7. An angle drill as in claim 4, wherein the coupling device includes an annular recess formed in one of the housing and the handle and an annular projection formed on the other of the housing and the handle, the annular recess and the annular projection engaging with each other so as to prevent the handle from moving in an axial direction along the rotational axis and to permit rotation of the handle relative to the housing. 8. An angle drill as in claim 7, wherein the annular projection is interrupted at plural positions in the circumferential direction so as to define the engaging recesses at the interrupted positions, respectively. 9. An angle drill as in claim 1, further including a spindle mounted within the housing and coupled to the motor, so that the spindle is rotatably driven by the motor, the spindle having a spindle axis that extends substantially perpendicular to the rotational axis of the housing. 10. An angle drill as in claim 9, further including a chuck mounted on the spindle, the chuck bein g arranged and constructed to removably hold a drill bit.