An object of the present invention is to provide a seat with a wakefulness maintaining device capable of efficiently fixing a driving source (for example, a motor) when a driving source (for example, a motor) is provided and vibration stimulation is given to a seated person. There is. The present invention relates to a seat with wakefulness maintaining device (S) provided with a wakefulness maintaining device (U) for applying a physical force to a seated person to promote wakefulness. A load support portion (20) for supporting the load on the back surface of the seated person is provided, and this load support part (20) constitutes a wakefulness maintaining device (U), and provides physical force to the seated person. The apparatus drive part (5) which provides is attached. The device drive unit (5) includes a drive source (54) and a support member (51). The support member (51) includes a drive source mounting surface portion (51A (51a)) and a load support portion. The gripping piece (51B (51d)) is attached to the load support portion (20) in a state where a part of the load support portion (20) is gripped.本発明の目的は、駆動源（例えば、モータ）を内装して着座者に振動刺激を与えるに当たり、効率良く駆動源（例えば、モータ）を固定することが可能な覚醒維持装置付シートを提供することにある。 着座者に物理的力を付与して覚醒を促すための覚醒維持装置（Ｕ）が備えられた覚醒維持装置付シート（Ｓ）に関する。着座者の背面の荷重を支持するための荷重支持部（２０）が配設されており、この荷重支持部（２０）には、覚醒維持装置（Ｕ）を構成し、着座者に物理的力を付与する装置駆動部（５）が取付けられている。装置駆動部（５）には、駆動源（５４）と、支持部材（５１）と、が備えられており、支持部材（５１）は、駆動源取付面部（５１Ａ（５１ａ））と荷重支持部挟持片（５１Ｂ（５１ｄ））とにより荷重支持部（２０）の一部を把持した状態で、荷重支持部（２０）に取付けられる。
