NOVELTY - One or more detection terminal is connectable to an electrode provided on a fuel cell. A resin connector case (30), which houses the detection terminal, has either a channel-shaped groove (43) or a protruding guide for mating and sliding with protruding guide or channel-shaped groove provided in the fuel cell when a connector is attached to fuel cell. The channel-shaped groove or protruding guide is provided on the connector case to extend in insertion direction when connector is attached to the fuel cell and set with a pitch equal to the stacking pitch of cells.    USE - For determining voltage of cells contained in fuel cell (claimed) formed by stacking of multiple cells.    ADVANTAGE - Ensures easy and proper attachment of the voltage detection connector to the fuel cell since connector case has either channel-shaped groove or protruding guide for mating and sliding with protruding guide or channel-shaped groove provided in fuel cell when connector is attached to the fuel cell, thus ensures reliable detection of the voltage of each cell of reduced-thickness fuel cell and performs highly accurate control of electric generation. Obtains improvement in structural strength by making the support that includes the mating portion of resin and making electrode that protrudes of metal. Simplifies attachment of voltage detection connector so that electrodes are sandwiched between the metals of each of the detection terminals by using the guide. Ensures fitting and positioning together of the guide and groove before inserting the voltage detection connector into the space formed by support and performs more effective guiding at the time of attachment by providing guide that is longer than the length of support in the protruding direction. Prevents offset in the attachment position by fitting the groove of another voltage detection connector to the guide at the aside of already-connected voltage detection connector when attaching another voltage detection connector in neighboring position relative to already attached voltage detection connector. Prevents damage to the cable since cable for voltage detection is lead out from the front surface of voltage detection connector to wire the cable in a direction along the upper surface of fuel cell without bending the cable.    DESCRIPTION OF DRAWING(S) - The figure shows the outer perspective view of a voltage detection connector.    Connector case (30)    Locking member (34)    Primary terminal housing (40)    Secondary terminal housing (42)    Channel-shaped groove (43)