[Problem] To prolong the effect of awakening support. A wake-up assistance device according to an embodiment, a detection unit that detects a drowsiness level of a driver of a moving body, and a determination that determines whether or not wake-up assistance for the driver is necessary based on the drowsiness level. And a control unit that applies a vibration stimulus to the driver by vibrating a vibration applying unit provided in the seat on which the driver sits, when the awakening support is determined to be necessary by the determination unit. , Is provided. When vibrating the vibration imparting unit, the control unit, at least in a part of the time zone, has a vibration waveform at a first frequency that promotes muscle tone and a vibration waveform at a second frequency that suppresses muscle tone. The vibration applying section is vibrated on the basis of the vibration waveform of the superimposed shape. [Selection diagram] Fig. 5
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