To provide an upper dead point lock mechanism equipped with an unlock release lever good in operability since in a table circular saw having a cutting machine body vertically moving a material to be cut in relation to a mounting table, a lever for releasing the upper dead point lock of the cutting machine body has been necessary to unlock-release apart from an operation to grip a handle part so far so that its operation is troublesome.

The lock release lever 51 is set along the gripping part 14a of the handle part 14, the lock release lever 51 is gripped to correspond to the gripping action of the gripping part 14a, and an unlock operation is carried out. In this way, an operation rod 52 is moved in the axial direction, and a lock pin is fitted/separated to/from a lock hole.