A storage device includes a housing including a storage space that stores a structural member; a cover member that is mounted on the housing, and causes an entrance of the storage space of the housing to be in a covered state and an uncovered state; and a fixing mechanism that fixes the cover member to the housing that is in the covered state. The structural member is stored at a first position and at a second position in an unfixed state in the storage space that is caused to be in the covered state by the cover member. The second position is closer to the cover member than the first position is. When the structural member has moved from the first position to the second position, the fixing mechanism causes the cover member to be more firmly fixed than when the structural member is stopped at the first position.