There are provided an electronic device mounting substrate and an electronic apparatus which are capable of enhancement in impact resistance. An electronic device mounting substrate (1) according to one aspect of the invention includes: a first wiring substrate (2) shaped in a rectangular frame, an interior of the rectangular frame constituting a first through hole (2a); a second wiring substrate (6) shaped in a rectangular frame or plate, the second wiring substrate (6) being disposed so as to overlie a lower surface of the first wiring substrate (2) and be electrically connected to the first wiring substrate (2), one of outer edges of the second wiring substrate (6) being located more outward than a corresponding one of outer edges of the first wiring substrate (2); a metallic plate (4) disposed so as to overlie a lower surface of the second wiring substrate (6) so that the second wiring substrate (6) is sandwiched between the metallic plate (4) and the first wiring substrate (2), outer edges of the metallic plate (4) being located more outward than the outer edges of the first wiring substrate (2) and more inward than the one of the outer edges of the second wiring substrate (6); and a lens holder (5) which is a lid body secured to an outer periphery of the metallic plate (4), with the one of the outer edges of the second wiring substrate (6) lying in between, so as to cover the first wiring substrate (2) and the second wiring substrate (6). A frame interior of the first wiring substrate (2), or a frame interior of each of the first wiring substrate (2) and the second wiring substrate (6), constitutes an electronic device mounting space (11).