A press machine (10, 10A) comprising: a supporting frame including a bolster; a ram vertically movably supported above the bolster; a slider which is fixed to a rear surface of the ram; a rail extending in a top-bottom direction to be slidably engaged with the slider; a movable base provided with the rail at its front surface and including a rear surface being a flat surface; a front flat surface provided to the supporting frame on which the rear surface of the movable base is overlaid; a coupling pin whose central axis is perpendicular to the rear surface of the movable base and the front flat surface, the coupling pin coupling the movable base to the supporting frame so as to be capable of tilting about the central axis; a plurality of fixing bolts perpendicular to the front flat surface and fixing the movable base to any desired tilted position; a pin hole penetrating through the supporting frame in a front-rear direction; an eccentric pin including a first shaft part and a second shaft part, the second shaft part being rotatably supported by the pin hole, the first shaft part eccentrically projecting frontward from the second shaft part and being accommodated in an engagement hole formed in the movable base, wherein a visual inspection hole smaller than the engagement hole is formed on a deeper part of the engagement hole to penetrate through the movable base; a relay block accommodated in the engagement hole of the movable base, supported slidably relative to the movable base in a tilting radius direction of the movable base, and including a fitting hole into which the first shaft part rotatably fits; a rotary operation part (61A, 64) provided to each of a rear end and a front end of the eccentric pin; and a motion converting unit converting a rotation operation on the rotary operation part (61A, 64) into tilting of the movable base, wherein the motion converting unit includes the eccentric pin, the relay block, and the engagement hole, a head part of the fixing bolt and the rotary operation part at the rear end of the eccentric pin are disposed on a rear surface of the supporting frame, and the rotary operation part at the front end of the eccentric pin is disposed in the engagement hole of the movable base. a supporting frame including a bolster; a ram vertically movably supported above the bolster; a slider which is fixed to a rear surface of the ram; a rail extending in a top-bottom direction to be slidably engaged with the slider; a movable base provided with the rail at its front surface and including a rear surface being a flat surface; a front flat surface provided to the supporting frame on which the rear surface of the movable base is overlaid; a coupling pin whose central axis is perpendicular to the rear surface of the movable base and the front flat surface, the coupling pin coupling the movable base to the supporting frame so as to be capable of tilting about the central axis; a plurality of fixing bolts perpendicular to the front flat surface and fixing the movable base to any desired tilted position; a pin hole penetrating through the supporting frame in a front-rear direction; an eccentric pin including a first shaft part and a second shaft part, the second shaft part being rotatably supported by the pin hole, the first shaft part eccentrically projecting frontward from the second shaft part and being accommodated in an engagement hole formed in the movable base, wherein a visual inspection hole smaller than the engagement hole is formed on a deeper part of the engagement hole to penetrate through the movable base; a relay block accommodated in the engagement hole of the movable base, supported slidably relative to the movable base in a tilting radius direction of the movable base, and including a fitting hole into which the first shaft part rotatably fits; a rotary operation part (61A, 64) provided to each of a rear end and a front end of the eccentric pin; and a motion converting unit converting a rotation operation on the rotary operation part (61A, 64) into tilting of the movable base, wherein the motion converting unit includes the eccentric pin, the relay block, and the engagement hole, a head part of the fixing bolt and the rotary operation part at the rear end of the eccentric pin are disposed on a rear surface of the supporting frame, and the rotary operation part at the front end of the eccentric pin is disposed in the engagement hole of the movable base.