A vehicle lighting unit comprising: a light emitting device disposed below a predetermined light source position and having an excitation light source, a wavelength conversion member disposed at a position spaced away from and above the excitation light source, a condensing lens disposed between the excitation light source and the wavelength conversion member, and a holder (18, 20, 22) configured to hold the excitation light source, the wavelength conversion member, and the condensing lens; the vehicle lighting unit characterized in that it comprises: a supporting member configured to support the light emitting device so as to allow the light emitting device to move horizontally; a first fixing member (50b, N1) configured to fix the light emitting device and the supporting member together in a state where the wavelength conversion member is disposed on a vertical axis passing through the predetermined light source position; a vertical guiding member, with which the supporting member is in surface contact and has a vertical guiding face to allow the supporting member to vertically slide in a state where the supporting member is in surface contact with the vertical guiding member; a stopper, with which the light emitting device supported by the supporting member that vertically slides is brought into contact to restrict the vertically sliding supporting member, thereby positioning the wavelength conversion member in the predetermined light source position; a second fixing member (46b, N2) configured to fix the supporting member and the vertical guiding member together in a state where the light emitting device is in contact with the stopper and the supporting member is in surface contact with the vertical guiding face; and a vehicle lighting unit main body configured to project light emitted from the light emitting device disposed below the predetermined light source position in a forward direction. a light emitting device disposed below a predetermined light source position and having an excitation light source, a wavelength conversion member disposed at a position spaced away from and above the excitation light source, a condensing lens disposed between the excitation light source and the wavelength conversion member, and a holder (18, 20, 22) configured to hold the excitation light source, the wavelength conversion member, and the condensing lens; the vehicle lighting unit characterized in that it comprises: a supporting member configured to support the light emitting device so as to allow the light emitting device to move horizontally; a first fixing member (50b, N1) configured to fix the light emitting device and the supporting member together in a state where the wavelength conversion member is disposed on a vertical axis passing through the predetermined light source position; a vertical guiding member, with which the supporting member is in surface contact and has a vertical guiding face to allow the supporting member to vertically slide in a state where the supporting member is in surface contact with the vertical guiding member; a stopper, with which the light emitting device supported by the supporting member that vertically slides is brought into contact to restrict the vertically sliding supporting member, thereby positioning the wavelength conversion member in the predetermined light source position; a second fixing member (46b, N2) configured to fix the supporting member and the vertical guiding member together in a state where the light emitting device is in contact with the stopper and the supporting member is in surface contact with the vertical guiding face; and a vehicle lighting unit main body configured to project light emitted from the light emitting device disposed below the predetermined light source position in a forward direction. a supporting member configured to support the light emitting device so as to allow the light emitting device to move horizontally; a first fixing member (50b, N1) configured to fix the light emitting device and the supporting member together in a state where the wavelength conversion member is disposed on a vertical axis passing through the predetermined light source position; a vertical guiding member, with which the supporting member is in surface contact and has a vertical guiding face to allow the supporting member to vertically slide in a state where the supporting member is in surface contact with the vertical guiding member; a stopper, with which the light emitting device supported by the supporting member that vertically slides is brought into contact to restrict the vertically sliding supporting member, thereby positioning the wavelength conversion member in the predetermined light source position; a second fixing member (46b, N2) configured to fix the supporting member and the vertical guiding member together in a state where the light emitting device is in contact with the stopper and the supporting member is in surface contact with the vertical guiding face; and a vehicle lighting unit main body configured to project light emitted from the light emitting device disposed below the predetermined light source position in a forward direction.