PURPOSE: To obtain a simple and inexpensive clock correction device for a facsimile capable of correcting the clock in a facsimile.

CONSTITUTION: In a facsimile containing a clock 3 for indicating the time of communication, a correction value register 4 containing a clock correction value and a setting switch 6 to define the address for the correction value register 4 are connected to a main controller 1. The main controller 1 reads the set address from the setting switch 6 for a predetermined period, reads the time correction value of the address out of the correction value register 4 and corrects the time of the above clock 3.