An assembled component includes a plurality of electrical connectors to be disposed on a circuit board in a specific positional arrangement; and an electrical connector cap attached to the electrical connectors for joining the electrical connectors before the electrical connectors are disposed onto the circuit board. The electrical connector cap includes a main body extending in a first direction and a second direction perpendicular to the first direction on a plane parallel to the circuit board and a first fitting section including a first reference surface. Each of the electrical connector includes a second fitting section for engaging the first fitting section. The second fitting section includes a second reference surface for contacting with the first reference surface, so that the electrical connectors are arranged in the specific positional arrangement.