A semiconductor package of the present invention, includes a wiring substrate, a lead pin fixed to a connection pad on one surface side of the wiring substrate by solder, and a reinforcing resin layer formed on a surface of the wiring substrate on which the lead pin is provided and having a projection-shaped resin portion which projects locally around the lead pin and covers a side surface of a base portion side of the lead pin. The projection-shaped resin portion has a top surface extending from an outer peripheral portion of the lead pin to an outside, and a side surface constituting a non-identical surface to the top surface.