The storage box includes an opening/closing mechanism. At a first stage, sliding of a lid relative to a box main body partially opens an opening. At a second stage, pivoting of the lid relative to the box main body fully opens the opening. At a third stage, pivoting of the lid relative to the box main body partially closes the opening. At a fourth stage, sliding of the lid relative to the box main body fully closes the opening. The first elastic member exerts elastic force for sliding the lid at the fourth stage. The second elastic member exerts elastic force for pivoting the lid at the second stage.