Abstract: [Object] A target cell capture filter is provided, having an improved capture ratio per unit area, structured as a filter for extracting and capturing target cells contained in a biological sample such as blood or the like in a simple manner, in a short period of time, and with high efficiency. [Solving Means] A target cell capture filter is structured to have a capture face for capturing target cells in a liquid. The target cell capture filter has multiple notches that allows a part of the capture face to be elastically deformed in a direction that is orthogonal to the capture face, thereby providing gaps. At least part of the plurality of notches are a first notch group including multiple notches designed such that there is a difference between the notches in a shortest distance from a greatest deformation location of the notch to an outer edge of the capture face, and such that the same elastic deformation amount is exhibited with respect to the impulse per unit area.