To surely fix a rotation object at desired angle without play in a drive device rotating the rotation object.

An open close drive device 30 is provided with a drive gear 4 rotated by drive of a motor 1, a driven gear 5 rotating a liquid crystal display 6 by driven and rotated by meshing with the drive gear 4, and a fixing gear 8. A block member 13 is moved to a bracket side 16 by drive of the motor 11, the fixing gear 8 moves in the driven gear 5 side while meshing with the drive gear 4 if tensile force of a fixing spring 10 overcomes tensile force of a separation spring 14 and meshes with the driven gear 5. The drive gear 4 and the driven gear 5 get to be irrotational and the liquid crystal display 6 is fixed irrotationally. On the other hand, the fixing gear 8 separates from the driven gear 5 when the block member 13 is moved to the bracket 15 side and the drive gear 4 and the driven gear 5 become irrotational.