To perform, by a simple operation, a test of an entire cable without breaking a capacitor even if a coaxial cable incorporating the capacitor is tested.

The high voltage test device performs a test on an electric insulation state by applying a high voltage with a coaxial cable 11 defined as a testing object, the coaxial cable comprising a core wire 11a and an insulated shield conductor 11b. The high voltage test device includes a high voltage test fixture 20 for connecting two output electrodes 31 and 32, or outputs of a testing machine outputting the high voltage, to a central conductor and the shield conductor respectively of the coaxial cable of the test object. A cable connecting part includes a core wire short circuit part P1 for electrically short-circuiting between length-directional one end and the other end of the core wire 11a of the coaxial cable, and a shield line short circuit part P2 for electrically short-circuiting between length-directional one end and the other end of the shield conductor 11b of the coaxial cable.