A sheet-shaped heat generator includes a pseudo sheet structure including a plurality of metal wires arranged at an interval, the metal wires each including a core including a first metal and a metal film provided on an exterior of the core, the metal film including a second metal different from the first metal, in which a volume resistivity of the first metal is in a range from 1.0×10−5 [Ω·cm] to 5.0×10−4 [Ω·cm], and a standard electrode potential of the second metal is +0.34 V or more.