A vapor phase cooling apparatus (10) includes: a housing (11) including a heat receiver (14a) configured to receive heat generated by an electronic component (50) that is a heat generating source, the electronic component (50) being connected to a vertical outer surface on the +Z side of the housing, the housing including an internal space for enclosing refrigerant; and a first heat sink (21) and a second heat sink (22) that are disposed on the +Y side and the −Y side from the electronic component (50) and that dissipate heat to the outside. Both ends of the first heat sink (21) and the second heat sink (22) in X direction extend further along the surface on the +Z side than both ends of the heat receiver (14a) in X direction.