To provide an assembled battery for use in an electric vehicle, etc., capable of high reliability connection of a battery with a connector using an inexpensive means free of strain generation, etc., even if the battery length involves dispersion.

An assembled battery is configured with a casing having a pair of supporting plates 2 and 3, a plurality of batteries 1 with both ends of each held pinchedly by the supporting plates 2 and 3, a connector 4 to connect the batteries in series electrically, and a resilient piece 5 installed between the casing and the connector 4. Thereby a high reliability connection of battery with connector can be established using an inexpensive means free of strain generation, etc., even if the battery length involves dispersion.