A valve opening-closing timing control apparatus, comprising: a driving-side rotational member synchronously rotating with a crankshaft of an internal combustion engine; a driven-side rotational member arranged to share a rotational axis with the driving-side rotational member and integrally rotating with a camshaft for opening and closing a valve of the internal combustion engine; a partition portion arranged on at least one of the driving-side rotational member and the driven-side rotational member, the partition portion partitioning a fluid pressure chamber formed between the driving-side rotational member and the driven-side rotational member into an advanced angle chamber and a retarded angle chamber; a phase control portion controlling a rotational phase of the driven-side rotational member relative to the driving-side rotational member by supplying and discharging a pressurized fluid to and from the advanced angle chamber and the retarded angle chamber; a lock mechanism (9, 62, 80) configured to lock the rotational phase at a predetermined phase, the lock mechanism (9, 62, 80) including a lock member (92a, 92b) positioned at one of the driving-side rotational member and the driven-side rotational member and a lock recess (60, 81, 93) positioned at the other one of the driving-side rotational member and the driven-side rotational member, the lock member (92a, 92b) and the lock recess (60, 81, 93) engaging with each other when the lock member (92a, 92b) is inserted into the lock recess (60, 81, 93) and disengaging with each other when the lock member (92a, 92b) is retracted from the lock recess (60, 81, 93); a lock control portion switching a state of the lock mechanism (9, 62, 80) between a locked state and an unlocked state by supplying and discharging the pressurized fluid to and from the lock recess (60, 81, 93); a phase controlling supply passage supplying the pressurized fluid to the advanced angle chamber and the retarded angle chamber; a lock controlling supply passage supplying the pressurized fluid to the lock recess (60, 81, 93); and a one-way valve blocking the pressurized fluid supplied to the lock controlling supply passage from flowing into the phase controlling supply passage. a driving-side rotational member synchronously rotating with a crankshaft of an internal combustion engine; a driven-side rotational member arranged to share a rotational axis with the driving-side rotational member and integrally rotating with a camshaft for opening and closing a valve of the internal combustion engine; a partition portion arranged on at least one of the driving-side rotational member and the driven-side rotational member, the partition portion partitioning a fluid pressure chamber formed between the driving-side rotational member and the driven-side rotational member into an advanced angle chamber and a retarded angle chamber; a phase control portion controlling a rotational phase of the driven-side rotational member relative to the driving-side rotational member by supplying and discharging a pressurized fluid to and from the advanced angle chamber and the retarded angle chamber; a lock mechanism (9, 62, 80) configured to lock the rotational phase at a predetermined phase, the lock mechanism (9, 62, 80) including a lock member (92a, 92b) positioned at one of the driving-side rotational member and the driven-side rotational member and a lock recess (60, 81, 93) positioned at the other one of the driving-side rotational member and the driven-side rotational member, the lock member (92a, 92b) and the lock recess (60, 81, 93) engaging with each other when the lock member (92a, 92b) is inserted into the lock recess (60, 81, 93) and disengaging with each other when the lock member (92a, 92b) is retracted from the lock recess (60, 81, 93); a lock control portion switching a state of the lock mechanism (9, 62, 80) between a locked state and an unlocked state by supplying and discharging the pressurized fluid to and from the lock recess (60, 81, 93); a phase controlling supply passage supplying the pressurized fluid to the advanced angle chamber and the retarded angle chamber; a lock controlling supply passage supplying the pressurized fluid to the lock recess (60, 81, 93); and a one-way valve blocking the pressurized fluid supplied to the lock controlling supply passage from flowing into the phase controlling supply passage.