Provided is a mounting structure capable of maintaining highly accurate connection reliability even when the temperature of the environment in which the mounting structure is used is high. Mounting structure (10) includes electronic component (11), metal (12), wiring substrate (13), and a preventing structure. Electronic component (11) includes first electrode (14). The melting point of metal (12) is 130° C. or less. Wiring substrate (13) includes second electrode (15) electrically connected to first electrode (14) via metal (12). The preventing structure prevents flowing-out of metal (12) in a melted state from a region where first electrode (14) and second electrode (15) are formed. Further, preventing structure (14) is formed in at least one member selected from electronic component (11) and wiring substrate (12).