The hub device includes a USB hub IC; a voltage converter that converts a source voltage supplied to the Hub device into a source voltage to be supplied to the USB device/devices connected to the plurality of downstream ports, and, in a case that the USB device/devices is/or in an abnormal condition, outputs a signal notifying the abnormal condition; and a plurality of switch units that interrupts a source voltage to the USB device/devices, and outputs an overcurrent detection signal when overcurrent flows into the USB device/devices, wherein the USB hub IC includes a plurality of overcurrent detection terminals into which the overcurrent detection signal from the plurality of switch units is input, and a signal notifying the abnormal condition causes the plurality of overcurrent detection terminals of the USB hub IC to be in an overcurrent detection condition.