PURPOSE: To eliminate a wiring connecting directly to the outside by constituting a micromachine without using a cord, and also, to provide the communication equipment of the micromachine which secures a transmitting system free from radio interference and having high reliability, and moreover, to execute a duplex communication and a multiplex communication between the micromachine and an external equipment.

CONSTITUTION: The communication equipment for executing communication between a micromachine 21 and the outside constituted of an external communication equipment 1 installed in the outside of the micromachine 21 and an internal communication equipment 11 installed in the micromachine 21, and a visible light and a rear infrared light extending from 600nm to 180nm are used as a communication means between the communication equipments 1, 11.