In the present invention, the shaft member is rotated by forming a plurality of introduction holes in the flange portion fixed to the shaft member, and driving the plurality of pin members toward the flange portion by fluid pressure, inserting them into the plurality of introduction holes, and engaging them. A slide locking device of a press machine that locks so as not to be possible, comprising: a ring-shaped body member fixed to a main body frame; a plurality of arc-shaped introduction holes formed in a flange portion; and a ring-shaped cylinder hole formed in the main body member in an axial direction. A ring-shaped piston member mounted to be movable, a plurality of pin members mounted to be movable in a plurality of holding holes of the ring-shaped piston, and a ring-shaped first fluid pressure for driving the ring-shaped piston member to the forward position. An operation chamber and a second fluid pressure operation chamber for driving the ring-shaped piston member to a retracted position, and the plurality of pin members are inserted into the introduction hole by the fluid pressure of the first fluid pressure operation chamber. At the same time, it is configured so that the plurality of pin members can be switched to the retracted position from the introduction hole through the ring-shaped piston member driven backward by the fluid pressure in the second fluid pressure operation chamber.
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