A peristaltic pump (4, 4') comprising: a mounting concave section on which a peristaltically-actuated tube connected to a liquid flow route, through which a predetermined liquid is circulatable, is mountable; a peristalsis section which compresses the peristaltically-actuated tube mounted on the mounting concave section in a radial direction and causes the peristaltically-actuated tube to be peristaltically actuated in a longitudinal direction such that a liquid therein is flowable in the liquid flow route; a rotor in which a plurality of the peristalsis sections are formed, wherein the rotor, when in use, rotates in the mounting concave section, and thereby, the peristaltically-actuated tube mounted on the mounting concave section is capable of being peristaltically actuated by the peristalsis section in a cycle, and displacement detecting means (18, 21) that is able to detect displacement of the peristaltically-actuated tube mounted on the mounting concave section in the radial direction; characterized in that - blockage detecting means is provided being able to detect a blockage of the liquid flow route based on the displacement detected by the displacement detecting means (18, 21), - the blockage detecting means is adapted to obtain an output waveform (α1, α2, α3, α4) by a continuous detection of the displacement performed by the displacement detecting means (18, 21) while the rotor is rotated such that the peristaltically-actuated tube is peristaltically actuated by the peristalsis section in a cycle, and - the blockage detecting means is adapted to perform detection of a blockage of the liquid flow route based on changes of the obtained output waveform (α1, α2, α3, α4). a mounting concave section on which a peristaltically-actuated tube connected to a liquid flow route, through which a predetermined liquid is circulatable, is mountable; a peristalsis section which compresses the peristaltically-actuated tube mounted on the mounting concave section in a radial direction and causes the peristaltically-actuated tube to be peristaltically actuated in a longitudinal direction such that a liquid therein is flowable in the liquid flow route; a rotor in which a plurality of the peristalsis sections are formed, wherein the rotor, when in use, rotates in the mounting concave section, and thereby, the peristaltically-actuated tube mounted on the mounting concave section is capable of being peristaltically actuated by the peristalsis section in a cycle, and displacement detecting means (18, 21) that is able to detect displacement of the peristaltically-actuated tube mounted on the mounting concave section in the radial direction; characterized in that - blockage detecting means is provided being able to detect a blockage of the liquid flow route based on the displacement detected by the displacement detecting means (18, 21), - the blockage detecting means is adapted to obtain an output waveform (α1, α2, α3, α4) by a continuous detection of the displacement performed by the displacement detecting means (18, 21) while the rotor is rotated such that the peristaltically-actuated tube is peristaltically actuated by the peristalsis section in a cycle, and - the blockage detecting means is adapted to perform detection of a blockage of the liquid flow route based on changes of the obtained output waveform (α1, α2, α3, α4). - blockage detecting means is provided being able to detect a blockage of the liquid flow route based on the displacement detected by the displacement detecting means (18, 21), - the blockage detecting means is adapted to obtain an output waveform (α1, α2, α3, α4) by a continuous detection of the displacement performed by the displacement detecting means (18, 21) while the rotor is rotated such that the peristaltically-actuated tube is peristaltically actuated by the peristalsis section in a cycle, and - the blockage detecting means is adapted to perform detection of a blockage of the liquid flow route based on changes of the obtained output waveform (α1, α2, α3, α4).