Provided is a capacitive transducer with improved reliability of sealing. The capacitive transducer includes a cell and a sealing portion. The cell includes a first electrode and a vibrating membrane having a second electrode formed to oppose the first electrode through intermediation of a cavity. An etching opening portion is formed to form the cavity by sacrifice layer etching. The sealing portion seals the etching opening portion. A gap at a periphery of the sealing portion has a height smaller than that of the cavity. In a manufacturing method therefor, in a step of forming a sacrifice layer for forming the cavity and the gap communicating to the cavity via an etching flow path, a height of the sacrifice layer in a region that is to become the gap is set to be smaller than that of the sacrifice layer in a region that is to become the cavity.