The invention provides a panel and a manufacturing method, wherein the panel realizes satisfactory strength, weight reduction and acoustic performance. Panel (17,18) has cavity (22) defined by inside thin sheet (23) fixed to the inside surface of outside thin sheet (21), and the cavity (22) is filled with foam (24). Preferably, the foam (24) consists of a rubber acoustic material of high expansion. For the inside thin sheet (23), not only circumferential edge portion (26) and circumferential side portion (25) for defining the cavity (22) but also recessed portion (27) for increasing the panelstrength is draw formed on the side of outside thin sheet (21). The bottom surfaces of the circumferential edge portion (26) and recessed portion (27) of the inside thin sheet (23) are bonded to the outside thin sheet (21) by a thermosetting adhesive.