A projection-type display apparatus including one or more light sources that emit pieces of light of first to third wavelength bands; first to third light modulation devices that modulate corresponding one of the pieces of light of the first to third wavelength bands; a color synthesis device that has a characteristic of reflecting or transmitting both S-polarized light and P-polarized light for the light of the first wavelength band, and reflecting the S-polarized light and transmitting the P-polarized light for the pieces of light of the second and third wavelength bands, and that synthesizes the pieces of light of the wavelength bands emitted from the first to third light modulation devices; and a projection optical system that projects the light synthesized by the color synthesis device, and full width at half maximum of a spectrum of the light of the first wavelength band that enters the color synthesis device is 40 nm or lower.