A joining apparatus (100) is an apparatus for performing joining of a joining target object (500) including multiple members (501, 502) stacked on each other and a thermosetting adhesive (503) arranged on joining target portions (505) of the multiple members (501, 502). The joining apparatus includes a first electrode (101) arranged to be contactable a surface of the joining target object (500) on one side in a stacking direction of the multiple members (501, 502); a second electrode (102) arranged to be contactable the surface of the joining target object (500) on one side or the other side in the stacking direction of the multiple members (501, 502); a pressurization mechanism configured to cause the first and second electrodes (101, 102) to pressure-contact the surface of the joining target object (500) in a vicinity of the joining target portions (505); a power source (50) configured to distribute power to between the first electrode (101) and the second electrode (102); and a control unit (60) configured to distribute the power to between both electrodes (101, 102) by the power source in a state in which the first electrode (101) and the second electrode (102) pressure-contact the surface by the pressurization mechanism, thereby performing joining of the joining target object (500) by curing of the thermosetting adhesive (503) by resistance heating generated at the joining target object (500).