A sports training apparatus for sports in which a ball or the like are played with a racket or the like, comprising a programmable microcomputer, an acoustic device and at least one input device, wherein the microcomputer can be controlled by the input device to output acoustic signals indicating specific motions by means of acoustic output devices and for changing the duration, interval and quality of said signals. The invention aims at providing a sports training device which is lasting and practical to use, e.g., small, lightweight and relatively easy and simple to use and offering mental support for practicing said sport. To this end, the microcomputer, the acoustic device and at least part of the input device are located in a casing having the form of a wrist-watch. The acoustic device comprises a voice generator for generating at least two different words. Part of the input device is formed by a push switch that starts execution of the microcomputer program, is retained by a cap that can be slid back by the finger of the sportsman and is fitted with a radio transmitter connected to the microcomputer.