To provide a highly safe locking device for frame bodies and a game machine having the locking device, which are capable of making it difficult to fraudulently unlock a key by rotating a key cylinder by combining the forcing motion and rotating motion of the key, making it difficult to fraudulently unlock the key by directly operating a link member, and capable of effectively preventing fraudulent unlocking.

The locking device 1 includes the key cylinder 34 with a key hole 34a to rotate according to the rotation of a key 37 inserted into the key hole 34a, and a stay 36 in association with the rotation of the key cylinder 34 to reciprocate. The locking device is to lock and unlock frame bodies 4 and 8 as a locking hook 36b is engaged or disengaged according to the reciprocation of the stay 36. At least part of the key cylinder 34 can be forced into the key hole 34a in the direction of insertion of the key 37 into the key hole 34a, and the stay 36 can be reciprocated only in the forced-in state by the rotation of the key cylinder 34.