A roof opening/closing apparatus includes a roof moved between first and second positions and structured with first, second and third panels, a first supporting mechanism movably supporting the first and second panels in association with each other, a second supporting mechanism movably supporting the third panel, a first lock mechanism locking the first panel to the vehicle body, a second lock mechanism locking the first supporting mechanism, and a third lock mechanism locking the third panel to the second panel. The roof is moved between the first position and the second position by the first and second supporting mechanisms and retained at the first position by the first to third lock mechanisms. The second and third lock mechanisms are connected to each other by an operational member and operated in association with each other to release locking operations thereof by the operational member.