A syringe pump to which a syringe (200, 300, 400) filled with a medicinal agent is attached and which is configured to send the medicinal agent in the syringe (200, 300, 400) to a patient, comprising: a syringe setting part configured to set a syringe body (201, 301, 401) of the syringe (200, 300, 400); and a syringe pusher driving part configured to push a syringe pusher (202, 302, 402) of the syringe (200, 300, 400), wherein the syringe pusher driving part includes a moving member configured to grip the syringe pusher (202, 302, 402) detachably and to push out the medicinal agent in the syringe body (201, 301, 401) by moving the syringe pusher (202, 302, 402) relative to the syringe body (201, 301, 401), a guiding member configured to move and guide the moving member to a side of the syringe body (201, 301, 401), and a cover member which covers the guiding member and which can be elastically deformed and contracted as the moving member moves to the side of the syringe body (201, 301, 401), characterized in that the cover member includes protruded parts (811, 812, 813, 814, 815, 816, 821, 822, 823) which are successive in a bellows-shape, the protruded parts (811, 812, 813, 814, 815, 816, 821, 822, 823) include two first protruded parts (811, 812, 813, 814, 815, 816) which are provided successively in an identical outer diameter dimension and at least one second protruded part (821, 822, 823) which is provided between the first protruded parts (811, 812, 813, 814, 815, 816) and which has an outer diameter dimension smaller than the outer diameter dimension of each of the first protruded parts (811, 812, 813, 814, 815, 816), and an outer diameter dimension of a connection part between the two successively-formed first protruded parts (811, 812, 813, 814, 815, 816) is set smaller than an outer diameter dimension of a connection part between the second protruded part (821, 822, 823) and the first protruded part (811, 812, 813, 814, 815, 816). a syringe setting part configured to set a syringe body (201, 301, 401) of the syringe (200, 300, 400); and a syringe pusher driving part configured to push a syringe pusher (202, 302, 402) of the syringe (200, 300, 400), wherein the syringe pusher driving part includes a moving member configured to grip the syringe pusher (202, 302, 402) detachably and to push out the medicinal agent in the syringe body (201, 301, 401) by moving the syringe pusher (202, 302, 402) relative to the syringe body (201, 301, 401), a guiding member configured to move and guide the moving member to a side of the syringe body (201, 301, 401), and a cover member which covers the guiding member and which can be elastically deformed and contracted as the moving member moves to the side of the syringe body (201, 301, 401), characterized in that the cover member includes protruded parts (811, 812, 813, 814, 815, 816, 821, 822, 823) which are successive in a bellows-shape, the protruded parts (811, 812, 813, 814, 815, 816, 821, 822, 823) include two first protruded parts (811, 812, 813, 814, 815, 816) which are provided successively in an identical outer diameter dimension and at least one second protruded part (821, 822, 823) which is provided between the first protruded parts (811, 812, 813, 814, 815, 816) and which has an outer diameter dimension smaller than the outer diameter dimension of each of the first protruded parts (811, 812, 813, 814, 815, 816), and an outer diameter dimension of a connection part between the two successively-formed first protruded parts (811, 812, 813, 814, 815, 816) is set smaller than an outer diameter dimension of a connection part between the second protruded part (821, 822, 823) and the first protruded part (811, 812, 813, 814, 815, 816).