A tissue collecting tool includes: a main body that is long; an operation part arranged on a proximal end side of the main body; a bag part including a bottom portion and an opening portion and having a part of the opening portion fixed to the main body such that the opening portion is positioned on a further proximal end side than the bottom portion; and a linear member connected to the opening portion and the operation part and raising the opening portion by being moved in a longitudinal direction of the main body.