To obtain a welding apparatus capable of preventing an object from being damaged when the object is positioned.

A welding apparatus 200 includes: a welding stage 10 that conveys a first object 70 placed on a placing surface 10S along a Y direction; and a positioning block 20 that abuts on the first object 70 on the welding stage 10 from its lateral side. The positioning block 20 abuts on the first object 70 not to tuck the first object 70, whereby a plane angle of the first object 70 and a position thereof in an X direction are each adjusted. When the welding stage 10 moves in a Y direction by a predetermined direction, the position of the first object 70 in the Y direction is adjusted.