To provide a manufacturing method of an electromagnetic relay with quality stabilization of the electromagnetic relay achieved, an electromagnetic relay with stabilized quality, and a manufacturing method of an electromagnetic relay capable of manufacturing the electromagnetic relay.

After finishing of a characteristics measurement process of components a, b consisting of processes I, II, a semi-complete product A is sent to a process III, where, a bar code of the semi-complete product A is read in, a component characteristics measurement value is loaded from the data base DB according to the ID of the bar code read in, and a adjustment target value is computed at a processor part 5. According to the adjustment target value, a characteristics adjustment is made by a characteristics adjustment means 6, and at the same time, the adjustment target value is registered in the data base DB in coordination with the ID. In processes IV, V, a bar code of a component a is read in with bar code reading means 4d, 4e, and at the same time, a characteristics test is made with a characteristics testing means 7a, 7b, whose result is registered in the data base DB in coordination with an ID shown in the bar code.