Abstract: The vehicle-mounted relay device in a vehicle-mounted communication system provided with a plurality of vehicle-mounted devices, the vehicle-mounted relay device includes: a relay unit configured to relay communication data between the plurality of vehicle-mounted devices; and a processing unit configured to, before communication is started between the vehicle-mounted devices, notify the vehicle-mounted devices of a common protocol that is a common communication protocol to be used.

Abstract: The in-vehicle management device includes: a detection unit configured to detect the presence of a target device that is an in-vehicle device that does not support a predetermined message among in-vehicle devices included in an in-vehicle network; and a control unit configured to perform control for causing the target device detected by the detection unit to transition to a sleep state when a state where the predetermined message from the in-vehicle devices does not arrive at the in-vehicle management device has continued for a predetermined period.

Abstract: Provided is a fuel cell having excellent gas diffusivity and leading to suppressed pressure drop even with a porous body as a gas path. The fuel cell includes: plural stacked power generating unit cells each having a membrane assembly, an anode separator stacked on the membrane assembly on one side, and a cathode separator stacked on the membrane assembly on the other side, wherein the anode separator of any one of the power generating unit cells is stacked on the cathode separator of another one thereof that is adjacent to said any one, the cathode separator has a porous body where an oxidizing gas flows, and a path enlarging member, and the path enlarging member includes gas path enlarging portions that enlarge a path formed by the porous body, the gas path enlarging portions having wall parts inclining or orthogonal to a direction where the oxidizing gas flows.