A light source apparatus including: a plurality of light source units (10-10; 10-11 to 10-14) with a plurality of primary light sources (18-1; 18-1, 18-2) for emitting primary light; a plurality of optical conversion units (12-1, 12-2; 12-1, 12-16) each comprising an optical conversion element for converting optical properties of the primary light to generate secondary light; a plurality of optical conversion unit holding members (92-1, 92-2, 92-3; 92-4, 92-5, 92-6) holding each a plurality of the optical conversion units (12-1, 12-2; 12-1, 12-16) to form an integrated optical conversion unit (84-1, 84-2, 84-3) respectively; a plurality of light guides for optically connecting the primary light sources (18-1; 18-1, 18-2) to the plurality of optical conversion units (12-1, 12-2; 12-1, 12-16) via an integrated connection portion, wherein the integrated connection portion comprises first connection portions attached to a light source unit side and second connection portions attached to an optical conversion unit side, the first connection portions are integrated together to form a first integrated connection portion (88; 102), the second connection portions are attached to a connection portion holding member to form a second integrated connection portion (90; 104), the first integrated connection portion and the second integrated connection portion form the integrated connection portion being removable, the plurality of optical conversion unit holding members (92-1, 92-2, 92-3; 92-4, 92-5, 92-6) forms an integrated optical conversion unit group together with a plurality of integrated optical conversion units (84-2, 84-3, 84-4, 84-4-A, 84-4-B, 84-5, 84-6), and the integrated optical conversion units which are members of the integrated optical conversion unit group are all attachable to and removable from the light source unit at the removable integrated connection portion; and at least two of the members (84-1, 84-2) of the integrated optical conversion unit group are different from each other. a plurality of light source units (10-10; 10-11 to 10-14) with a plurality of primary light sources (18-1; 18-1, 18-2) for emitting primary light; a plurality of optical conversion units (12-1, 12-2; 12-1, 12-16) each comprising an optical conversion element for converting optical properties of the primary light to generate secondary light; a plurality of optical conversion unit holding members (92-1, 92-2, 92-3; 92-4, 92-5, 92-6) holding each a plurality of the optical conversion units (12-1, 12-2; 12-1, 12-16) to form an integrated optical conversion unit (84-1, 84-2, 84-3) respectively; a plurality of light guides for optically connecting the primary light sources (18-1; 18-1, 18-2) to the plurality of optical conversion units (12-1, 12-2; 12-1, 12-16) via an integrated connection portion, wherein the integrated connection portion comprises first connection portions attached to a light source unit side and second connection portions attached to an optical conversion unit side, the first connection portions are integrated together to form a first integrated connection portion (88; 102), the second connection portions are attached to a connection portion holding member to form a second integrated connection portion (90; 104), the first integrated connection portion and the second integrated connection portion form the integrated connection portion being removable, the plurality of optical conversion unit holding members (92-1, 92-2, 92-3; 92-4, 92-5, 92-6) forms an integrated optical conversion unit group together with a plurality of integrated optical conversion units (84-2, 84-3, 84-4, 84-4-A, 84-4-B, 84-5, 84-6), and the integrated optical conversion units which are members of the integrated optical conversion unit group are all attachable to and removable from the light source unit at the removable integrated connection portion; and at least two of the members (84-1, 84-2) of the integrated optical conversion unit group are different from each other.