Patent ID: 6866216

Claim:
A recording medium cartridge for housing a recording medium, being used by being loaded into a drive device from a predetermined direction, and alternatively including a mode in which recording onto the recording medium is possible and a mode in which recording onto the recording medium is prohibited, the recording medium cartridge including a cartridge case that is substantially formed from an upper case and a lower case that respectively include a base panel and a wall enclosing a periphery of the base panel, with the walls of the upper case and the lower case being mutually joined together to house therein the recording medium, and rear sides, with respect to said predetermined direction, of the walls of the upper case and the lower case, having a substantially rectangular shape including a predetermined width and respective predetermined heights, wherein one of the upper case and the lower case includes a first opening formed in a rear side wall thereof, a second opening formed in the rear side wall thereof apart from the first opening in a width direction, a third opening formed in the base panel thereof, a switching member that is disposed in the first and third openings so as to be movable in the width direction and switches open and closed states of the first and third openings depending on positions of the switching member, and an operational member that is disposed connectedly with the switching member so that an operation in which said operational member is moved from the outside is possible, and exposed through the second opening, whereby the modes can be identified by the open and closed states of the first and third openings being distinguished from the outside; wherein the first and third openings are continuous and form a single opening.