A vehicular storage unit that includes: an elongated shaped storage unit main body that is formed with an opening open toward a vehicle cabin inner side; and a lid that is provided at the vehicle cabin inner side of the opening, and that is supported by the storage unit main body so as to be capable of moving along a length direction of the storage unit main body. An opening width of the opening increases from a specific position on progression from one side toward another side of the storage unit main body in a length direction, and a width of the lid is increased so as to follow the opening width of the opening.