A parts shelf (2) has a configuration in which a storage box holding member
for holding a plurality of parts storage boxes and a sensor holding member for
holding photoelectric sensors are provided separately from each other. As the photoelectric
sensor, an area sensor (100) capable of sensing coordinates of a position
in which light is shielded in a predetermined two-dimensional area close to the
front of the storage box holding member is employed. In an information processor
(1), information of parts corresponding to a plurality of parts storage
boxes of the storage box holding member and sizes and positions of the storage
boxes is pre-stored. On the basis of the pre-stored information and the light-shielded
position coordinates sensed by the area sensor, the storage box storing apart,
the hand of the operator has reached is sensed.
