A projector (PJ, 100) comprising: a first illumination light source that is a blue laser light source configured to emit a blue laser light ray as a first illumination light ray which is a first polarized light when an s-polarized light, which is linearly polarized light, is set as the first polarized light and a p-polarized light, which is linearly polarized light, is set as a second polarized light; a second illumination light source that is a phosphor configured to emit a yellow illumination light ray as a second illumination light ray containing a red band component and a green band component, the yellow illumination light ray being generated by irradiating the phosphor with the first illumination light ray; a first dichroic mirror, which is arranged on an optical path of the first and second illumination light rays, comprising a specific polarization reflection area which reflects the first polarized light and transmits the second polarized light and the second illumination light ray, and a transmission area which transmits the first and second illumination light rays; and a polarization conversion element, characterized in that it further comprises a first phase difference plate, which is arranged on an optical path of the first and second illumination light rays which pass through the first dichroic mirror, configured to convert the linearly polarized light into circularly polarized light; and in that the polarization conversion element is arranged on an optical path of the first and second illumination light rays transmitted through the first phase difference plate and includes a polarization beam splitter configured to transmit a polarized light of either the first polarized light or the second polarized light and to shift an optical axis of the other polarized light, and further characterized in that the polarization conversion element further includes a second phase difference plate configured to align the first and second illumination light rays to the first polarized light or the second polarized light. a first illumination light source that is a blue laser light source configured to emit a blue laser light ray as a first illumination light ray which is a first polarized light when an s-polarized light, which is linearly polarized light, is set as the first polarized light and a p-polarized light, which is linearly polarized light, is set as a second polarized light; a second illumination light source that is a phosphor configured to emit a yellow illumination light ray as a second illumination light ray containing a red band component and a green band component, the yellow illumination light ray being generated by irradiating the phosphor with the first illumination light ray; a first dichroic mirror, which is arranged on an optical path of the first and second illumination light rays, comprising a specific polarization reflection area which reflects the first polarized light and transmits the second polarized light and the second illumination light ray, and a transmission area which transmits the first and second illumination light rays; and a polarization conversion element, characterized in that it further comprises a first phase difference plate, which is arranged on an optical path of the first and second illumination light rays which pass through the first dichroic mirror, configured to convert the linearly polarized light into circularly polarized light; and in that the polarization conversion element is arranged on an optical path of the first and second illumination light rays transmitted through the first phase difference plate and includes a polarization beam splitter configured to transmit a polarized light of either the first polarized light or the second polarized light and to shift an optical axis of the other polarized light, and further characterized in that the polarization conversion element further includes a second phase difference plate configured to align the first and second illumination light rays to the first polarized light or the second polarized light.