To provide a video interphone device for a multiple dwelling house, which displays a state of voltage monitor of a video trunk line outside a house and is capable of immediately finding a position of abnormality.

The device connects a multiple dwelling entrance unit 1 with a camera IC to a controller 2, connects the controller 2 to each of a monitor 31 of plural house units 3, 3,... and transmitter/receiver 32 with the video trunk line L and an audio trunk line by bus, branches and supplies a power source and a video signals from the controller 2 to the monitor 31 of plural house units 3 by way of a branch unit 4 interposed by the video trunk line and performs call by outputting an image of the video signal to the monitor by calling each house unit 13 from the multiple dwelling house entrance unit 1. A Zener diode 41 with threshold voltage set as the minimum voltage to be supplied to the video trunk line and a display light 42 to be turned on when the voltage over the threshold voltage is impressed on the Zener diode are provided in each branching unit 40.