The objective of the present invention is to provide a light-emitting element light source module with which a plurality of light-emitting elements can be cooled efficiently and with high uniformity. This light-emitting element light source module is provided with a light source unit, in which a plurality of light-emitting elements are disposed on the surface of a heat sink, and a cooling block, which is disposed on the rear surface of the heat sink, said module being characterized in that: a cooling channel for distributing a cooling medium is formed in the heat sink; the channel width of the cooling channel is greater than the channel height; the cooling channel has a flat cross-sectional shape that extends along the surface of the heat sink; a cooling medium supply port and cooling medium discharge port of the cooling channel are connected, respectively, to a cooling medium supply channel and cooling medium discharge channel formed in the cooling block; the cooling channel has a plurality of channel portions being contiguous to each other in a region directly below a light-emitting element disposition region in which the light-emitting elements are disposed on the surface of the heat sink, and being adjacent to each other with a thermally conductive partition wall portion therebetween; and the thickness of the thermally conductive partition wall portion is smaller than the channel width of the cooling channel.