PURPOSE: To enable about how much a record stylus has worn to be readily examined and enable the optimum time for exchanging of the record stylus to be checked correctly by the user by forming grooves of different heights in a record disc and making use of the differences in reproduction styles.

CONSTITUTION: Audio signals are recorded in the grooves of always a fixed width of a record disc 4, and e.g., spot frequencies are recorded at varying heights from the bottom of the non-modulated grooves, i.e., by a recording method of high and low system. Such plural kinds of grooves 5 thru 7 of different heights are so formed that they become subsequently higher in the order of from the groove 5 of, e.g., the outside circumference of the record disc to the grooves of the inner circumference. Such record disc 4 is set to a player and the signals are reproduced subsequently from the outer circumferential zone, whereby the degrees of the wear of a record stylus are judged from the positions of the zone where the recording signals may be reproduced.