A valve opening/closing timing control apparatus includes a phase displacing mechanism 1 for displacing relative phase between a drive-side rotational member 12 and a driven-side rotational member 11 rotatable in unison with a cam shaft, a locking mechanism 6 capable of locking the relative phase to an intermediate locking phase suitable for starting and releasing this lock by a work fluid when needed and an urging mechanism 3 configured to provide an urging function for urging the phase displacing mechanism 1 toward an advancing side in a restricted range between an intermediate restricting phase located more on the retarding side than the intermediate locking phase and a most retarding phase.