To provide a resistance welding apparatus capable of managing energy supplied to a welding target.

This resistance welding apparatus carrying a primary current to a primary side of a welding transformer through a switching part to generate a secondary current on a secondary side of the welding transformer, and making the secondary current flow between welding electrodes through the welding target includes: a welding control part generating a control signal controlling a conduction state of the switching part; and a welding information monitor part detecting the energy supplied to the welding target. The welding control part generates the control signal bringing the switching part into the conduction state when having received a welding start instruction from a separately provided operation means, and bringing the switching part into a non-conduction state when the energy supplied from the welding information monitor part has exceeded preset supply energy.