BUS BAR MODULE

A bus bar module is to be installed to a battery pack for serially connecting plural battery elements in the battery pack. The bus bar module includes an output terminal that has a male screw, a tab for preventing, when connecting a wiring terminal with the male screw, the wiring terminal from being rotated subserviently, and a terminal connecting portion with which a terminal of one of the plural battery elements is connected, and a module main body that is formed of an insulative material and from which a portion of a terminal installation portion to which the output terminal is installed is protruded. The terminal installation portion has an engagement tab that elastically deforms during an installation of the output terminal and recovers after the installation to engage the output terminal with the terminal installation portion. The tab is located at a position that prevents a tool from contacting with the engagement tab when connecting the terminal connecting portion with the terminal of the one of the plural battery elements. According to the bus bar module, the output terminal can be prevented from dropping off even during its installation to the battery pack.