An AED (1) is provided with a detector (10) and a notifier. The notifier has a display unit (40) and a sounder (50). The display unit (40) executes a first mode and a second mode alternately and one or more times respectively. In the first mode, the display unit (40) makes at least one light source (42) emit light with a first intensity. In the second mode, the display unit (40) either makes the light source (42) emit light with a second intensity lower in power consumption than the first intensity, or makes the light source (42) not emit light. The sounder (50) executes a third mode and a fourth mode alternately and one or more times respectively. In the third mode, the sounder (50) generates an alert sound with a third intensity. In the fourth mode, the sounder (50) either generates the alert sound with a fourth intensity lower in power consumption than the third intensity, or does not generate the alert sound. At least a half part of each period of the first mode overlaps timewise with a corresponding period of the fourth mode. At least a half part of each period of the third mode overlaps timewise with a corresponding period of the second mode.
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