A lock device includes a base member fixed on an opening/closing member, an operation member rotatably supported on the base member, and a rod configured to move forward and backward to be engaged with and disengaged from a locked portion of the fixed member in response to operation of the operation member. The operation member includes a pivot portion and a transmission portion. The base member includes a first attachment portion and a second attachment portion. When the transmission portion presses an inclined surface of the rod and thus causes the rod to move backward, the first attachment portion abuts against the rod, thereby limiting movement of the rod in the direction intersecting with the forward and backward movement direction of the rod.