A manufacturing method of a chip integrated substrate is disclosed. The manufacturing method includes a first step that forms a wiring structure to be connected to a semiconductor chip on a first core substrate; a second step that disposes the semiconductor chip on a second core substrate; and a third step that bonds the first core substrate on which the wiring structure is formed to the second core substrate on which the semiconductor chip is disposed. In addition, the manufacturing method includes a step that removes the first core substrate after the third step and a step that removes the second core substrate after the third step.