A manufacturing method for a semiconductor device embedded substrate, includes: a first step of preparing a semiconductor device having a first insulating layer; a second step of preparing a support body, and arranging the semiconductor device on one surface of the support body; a third step of forming a second insulating layer on the one surface of the support body; a fourth step of removing the support body; a fifth step of forming a first wiring pattern on a surface of each of the first insulating layer and the second insulating layer; a sixth step of forming a via-hole from which the first wiring pattern is exposed on the second insulating layer; and a seventh step of forming a second wiring pattern electrically connected on a surface of the second insulating layer.