PROBLEM TO BE SOLVED: To provide a pump device and an endoscope device using the same that can be reduced in size and obtain a sufficient flow rate.SOLUTION: The pump device produces, on a first elastic thin film forming at least a part of a flow path wall surface, a travelling wave propagating in a longitudinal direction of a flow path, and conveys a fluid in the flow path. The pump device includes a vibrating means for producing the traveling wave by vibrating a predetermined part of the first elastic thin film in an out-of-plane direction. Further, the first elastic thin film forms a part of a chamber sealing a non compressible fluid therein, and a second elastic thin film forms another part of the chamber. A traveling wave is produced on the second elastic thin film by a vibrating mechanism for acting on the second elastic thin film, and the traveling wave is produced on the first elastic thin film by a displacement of the non compressible fluid due to the traveling wave produced on the second elastic thin film. The traveling wave produced on the first elastic thin film has a substantially greater displacement in the out-of-plane direction than the traveling wave produced on the second elastic thin film.【課題】小型化が可能であり、十分な流量を得ることのできる、ポンプ装置及びそれを用いた内視鏡装置を提供する。【解決手段】流路壁面の少なくとも一部を構成する第１可撓性薄膜に、流路の長手方向に伝播する進行波を発生させて流路内の流体を搬送するポンプ装置であって、第１可撓性薄膜の所定部位を面外方向に加振することにより進行波を生起させる加振手段を備える。また、第１可撓性薄膜が非圧縮性流体を封入したチャンバーの一部を構成し、第２可撓性薄膜がチャンバーの他の一部を構成し、第２可撓性薄膜に作用する加振機構によって第２可撓性薄膜に進行波を生起させ、第２可撓性薄膜に生起された進行波に伴う非圧縮性流体の変位によって、第１の可撓性薄膜に進行波を生起させ、第２可撓性薄膜に生起された進行波よりも、第１可撓性薄膜に生起させた進行波の方が面外変位が実質的に大きい。【選択図】図１
