A fuel cell stack (FS) configured by laminating a plurality of single cells (C), each formed by sandwiching a membrane-electrode assembly (1) with a pair of separators (2), has a coolant flow path (F) formed between adjacent single cells (C) for allowing coolant flow and a displacement absorption member (5) that is disposed within the coolant flow path (F) for absorbing a displacement generated between the single cells (C). The displacement absorption member (5) is provided with a flow path resistance reduction means (16, 36) for reducing a flow path resistance of the coolant in the coolant flow path (F) such that a pressure loss in the coolant flow path (F) is reduced while maintaining the spring characteristics of the displacement absorption member (5).
