A endoscopic device for use in a laparoscopic surgical procedure such as a cystectomy is disclosed. The timing at which a value of the selection signal changes from the first value to the second value is in the period in which potential levels of the clock signals respectively represented by the first and second values are the same. The multilayer dielectric layer has a thickness of at least four times as large as a thickness of the electrode layer and 4 m to 16 m inclusive.