To improve the single crystallinity of a stacked film in which a ZrO2 film and a Y2O3 film are stacked or a YSZ film. A crystal film includes a Zr film and a stacked film in which a ZrO2 film and a Y2O3 film formed on the Zr film are stacked, and has a peak half-value width when the stacked film is evaluated by X-ray diffraction being 0.05° to 2.0°.