Reporters obtained the following quote from the background information supplied by the inventors:“The present invention relates to a motion detecting device th at detects a motion of an operator’s fingerfor remotely operating a multi-artic ulated robot.“Conventionally, a remote control system in which a robot hand, which is an exam ple of a multiarticulatedrobot, is remotely controlled by an operator has been utilized. For example, Japanese UnexaminedPatent Application Publication No. H 4-210390 discloses a technique for operating a robot hand byfollowing a detecte d operation of a finger of an operator who puts on a glove, in which a sensor an d anoptical fiber for detecting an operation of a finger is provided.