To provide a private branch switchboard for a business establishment cordless system that is in an inexpensive configuration and supplies highly accurate time information to an exclusive terminal and/or peripheral equipment.

Private branch switchboards 1, 21, and 31 for a business establishment cordless system have a clock circuit 11 for generating time information and supply time information from the clock circuit 11 to an exclusive terminal 4 and/or peripheral equipment 5. Further, the boards are provided with a frequency conversion means 12 for performing the frequency conversion of a clock signal for a highly accurate oscillator 6 for the business establishment cordless system for generating a carrier frequency or the like with a business establishment cordless slave telephone 3, and generate time information from the clock circuit 11 based on a clock signal hat is frequency-converted by the frequency conversion means 12.