| 摘要 |
According to one embodiment, a pressing member includes: a band-like pressing portion placed on a heat receiving block arranged on an element mounted on a substrate, the pressing portion configured to press the heat receiving block against the element; a first arm, one end of the first arm being connected to one longitudinal end of the pressing portion, other end of the first arm being connected to the substrate; and a second arm, one end of the second arm being connected to other longitudinal end of the pressing portion, other end of the second arm being connected to the substrate, wherein the first arm and the second arm are connected to the pressing portion in a bent shape as seen in a planar view from above a surface of the substrate.
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