CELL STACK DEVICE, MODULE, AND MODULE HOUSING DEVICE

A cell stack device () includes a cell stack () constituted by arraying and electrically connecting cells (), and a pair of conductive members () respectively located on two ends of the cell stack () in an array direction x of the cells () and electrically connected to the cells (). Each conductive member () includes a power receiving portion () facing the cell stack () and a current extraction portion () extending from the power receiving portion (). The current extraction portion () includes an extraction portion body () and a connecting portion () to be connected to an external device. When a direction in which the current extraction portion () extends from the power receiving portion () is defined as a first direction and a direction orthogonal to the first direction is defined as a second direction, the extraction portion body () includes, in the second direction, a first part shorter in length than an average length of the extraction portion body ().