To provide an assembly wiring instructing apparatus in which a three- dimensional image is stereoscopically projected on a half mirror, a mirror is provided between a projector and the half mirror in order to adjust a path through which the three-dimensional image passes and an instruction from a wiring instruction controller is received in a form of an audio signal, thereby eliminating figure information and automatizing the assembly of electronic parts to a board.

A man-machine interface between an operator and an wiring instructing device 13 includes a microphone 8, a headphone 7, a switch 9, projectors 1, 2 and a half mirror 6. The operator obtains and confirms information by seeing and listening on the basis of an actual image and an image projected on the half mirror 6. A mirror 5 is arranged between the projectors 1, 2 and the half mirror 6 and is used to adjust a passage through which a three-dimensional image passes. The half mirror 6, the projectors 1, 2, the mirror 5, the headphone 7, the microphone 8, and the switch 9 are attached to a head band 20. The operator can put the head band 20 on his head like a cap.