An object of the present invention is to provide a mounting substrate, a manufacturing method, a light-emitting module and an illumination device that can sufficiently improve the luminous efficiency of an LED lamp. A mounting substrate (101) according to the present invention includes a substrate (108) and a reflective film (106) that is formed on a front surface of the substrate (108) and has a front surface on which LED chips (102) are to be mounted, and the reflective film (106) is made of metal oxide microparticles and a glass frit, and reflects light from the LED chips (102).
