Composite member, and heat generation device, building member and light emitting device, each of which uses same

A composite member comprising:

• a matrix part comprising multiple particles made from an inorganic substance, the particles of the inorganic substance bonding with each other to form the matrix part;
• and
• an organic infrared absorbing material present in a dispersed state inside the matrix part,
• wherein the inorganic substance consists of at least one substance selected from the group consisting of an oxide of a metal element, a nitride of the metal element, a hydroxide of the metal element, a sulfide of the metal element, a boride of the metal element, a carbide of the metal element, and a halide of the metal element,
• wherein the metal element is selected from the group consisting of an alkali metal, an alkaline earth metal, a transition metal, and a base metal, wherein the inorganic substance contains the at least one substance in an amount of 50 mol % or more,
• wherein the particles of the inorganic substance bond with each other via a connection part derived from the inorganic substance, and
• wherein, when a cross section of the matrix part is observed, an average value of a percentage of pores per unit area is 20% or less.