A temperature difference measuring apparatus includes: a bottomed tubular package in which a top face side is opened； a MEMS device disposed on an inner bottom face of the package, the MEMS device comprising at least one thermopile that measures a temperature difference, which is generated in the MEMS device by inflow heat through a bottom of the package； and a heat quantity increasing unit configured to increase a heat quantity flowing out from the MEMS device onto the top face side of the bottomed tubular package.
