A substrate holding/rotating device includes an urging unit, urging support portions of movable pins to either an open position or a hold position, first and second driving magnets, mounted in correspondence to respective movable pins of respective first and second movable pin groups and having mutually opposite magnetic pole directions, a first moving magnet, for urging the support portions of the first movable pin group to the other of either the open position or the hold position, and a second moving magnet, for urging the support portions of the second movable pin group to the other of either the open position or the hold position.