Recording tape cartridge

A tape cartridge capable of being inserted at a tape drive which carries out at least one of reading and writing of data when the tape cartridge is inserted, the tape cartridge comprising:

• (I) a reel on which recording tape is wound;
• (II) a leader block to which a free end of the tape is attached;
• (III) a hollow case accommodating the reel, the case including a ceiling plate and a floor plate, which face one another with a predetermined spacing, and a peripheral wall which joins outer peripheries of the ceiling plate and floor plate;
• and
• (IV) a leader block-retaining portion including a recess formed in the case so as to extend from the ceiling plate to the floor plate via the peripheral wall, the recess formed by a pair of wall bodies which oppose one another and an opening aperture formed between case inward side end portions of the two wall bodies, the recess being capable of accommodating the leader block, and the opening aperture being covered by the leader block when the leader block is accommodated at the recess;
• wherein one of the wall bodies comprises an urging member which urges the leader block to the other wall body side when the leader block is accommodated, and wherein a direction of an urging force provided by the urging member is directed at a surface of the other of the wall bodies.