In a biopsy needle (100) according to the present invention, a moving mechanism is configured to cause each of an outer needle (110) and an inner needle (120) to independently slide in a longitudinal direction, and configured such that a maximum distance by which an outer needle (111) is slidable in a distal end direction is set to be longer than a maximum distance by which the inner needle (120) is slidable in the distal end direction such that, by movement of the moving mechanism, the outer needle (110) and the inner needle (120) switch between a first state, in which a second needle tip (121) of the inner needle is positioned closer to a distal end than a first needle tip (111) of the outer needle, and a second state, in which a position of the first needle tip (111) in the longitudinal direction is located closer to the distal end than a proximal end of an inclined surface (122) of the inner needle and a distance (D 2 ) between the first needle tip and the second needle tip is shorter than a distance (D 1 ) between the first needle tip and the second needle tip in the first state.
