Magnetic recording tape cassette

A magnetic recording tape cassette comprising,

• a bottom case and a top case, said bottom case being assembled with said top case to provide a tape chamber therebetween,
• one or more tape roll members mounted in the tape chamber on the bottom wall of the bottom case, each of said tape roll members including a hub having a magnetic recording tape wound thereon and provided with a top projection for pivoting the hub, a resilient spring-biased member fixed to the undersurface of the top wall of the top case and having one or more arms with the free ends thereof extending to the top projection of the corresponding hubs to resiliently, rotatably fix the hubs in position, and
• a recess disposed in the undersurface of the top wall of the top case for accommodating the fixed portion of the spring member, said recess having a depth substantially equal to or larger than the thickness of the spring plate so as to position the resilient spring member to prevent contact of the intermediate portion of the resilient spring member onto the top surface of the tape roll member, said recess extending to at least a position corresponding to the maximum diameter of the tape roll member.