The invention realizes excellent electrical and mechanical connection between electrodes in a packaging structure where a plurality of semiconductor chips having electrodes are connected with each other through the low-melting metallic members. Bump electrodes are formed on a front surface of a first semiconductor chip. Penetrating holes are formed in a second semiconductor chip, and a penetrating electrode having a gap in a center is formed in each of the penetrating holes. Low-melting metallic members are interposed between connecting surfaces of the bump electrodes and the penetrating electrodes, and a part of each of the low-melting metallic members flows in each of the gaps of the penetrating electrodes when dissolved. This prevents short-circuiting between the bump electrodes which is caused by oversupplying the low-melting metallic members between the adjacent bump electrodes.