A slide lock device for a machine press that locks a slide of the machine press by locking a shaft member not to rotate that rotates together with a raising and lowering operation of said slide, comprising: a flange member fitted over and fixed to said shaft member so as not to rotate with respect thereto, and comprising a flange portion that is parallel to a plane orthogonal to an axis of said shaft member; an annular main body member fixed to a main frame of said machine press, and comprising a facing wall portion that opposes said flange portion with a certain gap therebetween; a plurality of retaining holes formed in said facing wall portion of said main body member parallel to said axis, and opposing said flange portion; a plurality of pin members, each one of which is installed in one of said plurality of retaining holes so as to be shiftable therein; a main body auxiliary member that opposes said flange portion from an opposite side to said plurality of retaining holes and that is fixed to the main body member; a plurality of actuators for driving said plurality of pin members respectively between an advanced position in which it is advanced towards said main body auxiliary member and a retracted position in which it is pulled back from said advanced position; and a plurality of stopper engagement portions (18, 18A) formed on said flange portion at positions in a radial direction with respect to said axis that are the same as those of the pin members and with fixed gaps between them in the circumferential direction, and a plurality of insertion apertures (19, 19A) each formed as an arc between adjacent ones of the stopper engagement portions (18, 18A); and adapted so that when, in order to lock said slide, the plurality of pin members are all driven towards their advanced positions by said plurality of actuators, at least one of said pin members is inserted into one of said insertion apertures (19, 19A) and at least one of said stopper engagement portions (18, 18A) at an end portion of this insertion aperture (19, 19A) can be stopped with said pin member; characterized in that said slide lock device comprises: a plurality of support holes that are formed in said main body auxiliary member so as to be able to pass end portions of said plurality of pin members and wherein an end portion of the pin member that passes through said insertion aperture (19, 19A) is inserted into said corresponding support hole so that both ends of said pin member are supported. a flange member fitted over and fixed to said shaft member so as not to rotate with respect thereto, and comprising a flange portion that is parallel to a plane orthogonal to an axis of said shaft member; an annular main body member fixed to a main frame of said machine press, and comprising a facing wall portion that opposes said flange portion with a certain gap therebetween; a plurality of retaining holes formed in said facing wall portion of said main body member parallel to said axis, and opposing said flange portion; a plurality of pin members, each one of which is installed in one of said plurality of retaining holes so as to be shiftable therein; a main body auxiliary member that opposes said flange portion from an opposite side to said plurality of retaining holes and that is fixed to the main body member; a plurality of actuators for driving said plurality of pin members respectively between an advanced position in which it is advanced towards said main body auxiliary member and a retracted position in which it is pulled back from said advanced position; and a plurality of stopper engagement portions (18, 18A) formed on said flange portion at positions in a radial direction with respect to said axis that are the same as those of the pin members and with fixed gaps between them in the circumferential direction, and a plurality of insertion apertures (19, 19A) each formed as an arc between adjacent ones of the stopper engagement portions (18, 18A); and adapted so that when, in order to lock said slide, the plurality of pin members are all driven towards their advanced positions by said plurality of actuators, at least one of said pin members is inserted into one of said insertion apertures (19, 19A) and at least one of said stopper engagement portions (18, 18A) at an end portion of this insertion aperture (19, 19A) can be stopped with said pin member; a plurality of support holes that are formed in said main body auxiliary member so as to be able to pass end portions of said plurality of pin members and wherein an end portion of the pin member that passes through said insertion aperture (19, 19A) is inserted into said corresponding support hole so that both ends of said pin member are supported.