To provide a tool magazine device which has a movable cover with which a vertical machine tool can position with high precision, and which can accelerate the tool change time and simplify the structure.

A main shaft head 6 which is vertically movable is arranged between a first slider 4 which is arranged on a bed 1 and longitudinally movable, a second slider 5 laterally movable, and a pair of guide rails 31, 41 with which the second slider 5 is laterally movable. A movable cover 91 is mounted on a magazine plate 72 so as to turn integrally with the magazine plate 72 and to close an open section of a cover device 90 when the magazine plate 72 is at a resting position.