Provided is a test apparatus that tests a device under test, including a power supply that generates supply power supplied to the device under test, a transmission path that transmits the supply power generated by the power supply to the device under test, an intermediate capacitor that is provided between the transmission path and a ground potential, a power supply current measuring section that measures a current flowing through the transmission path at a position closer to the power supply than the intermediate capacitor, a charge and discharge current measuring section that measures a charge and discharge current of the intermediate capacitor, and a load current calculating section that calculates a load current flowing through the device under test based on a sum of the current measured by the power supply current measuring section and the current measured by the charge and discharge current measuring section.