To provide an information notice system which can quickly recognize the alarm of condition changes even in a violent noise or the like in environment and is small-sized and lightweight and is convenient to carry.

This system consists of a transmitter 1 which has an incorporated sensor and transmits sensed information as a peculiarly set ID signal, and a receiver 10 which receives the transmission signal from this transmitter and analyzes it to notify a user of the analysis result. One of more repeaters 11 and 12 are interposed between the transmitter 1 and the receiver 10, and ≤500 ×V weak radio wave is used for signal transmission. The receiver 10 is provided with an LCD device and/or a motor vibration. The timer circuit of a CPU incorporated in the receiver 10 acts to repeat a notice means infinitely in the case that sensed information is alarm information reporting a danger, and a single frequency is used for signal transmission. The receiver 10 represents, for example, a wristwatch type information notice system.