When the magnetic tape cassette is to be used, for example, when it is desired to record or reproduce signals on tape 5 by means of a head engageable therewith through opening 6, lid member 7 is first bodily displaced forwardly in {TAIL ~ the direction} of the arrow b on FIG 9 relative to casing 1, and then lid member 7 is pivoted relative to {HEAD ~ casing} 1, for example, in the upward direction as indicated by the arrow c on FIG 10 
When the magnetic tape cassette is to be used , for example , when it is desired to record or reproduce signals on tape 5 by means of a head engageable therewith through opening 6 , lid member 7 is first bodily displaced forwardly in { TAIL ~ the direction } of the arrow b on FIG 9 relative to casing 1 , and then lid member 7 is pivoted relative to { HEAD ~ casing } 1 , for example , in the upward direction as indicated by the arrow c on FIG 10
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