A medicament dispenser comprising: a sucking part coupled to an upper portion of a container to suck a liquid medicament stored in the container; a pumping part coupled to one side of the sucking part to perform a pumping operation, such that the medicament is discharged or sprayed by a predetermined setting amount; an outlet (30, 30') installed at an upper end of the pumping part to release the medicament; a piston moved up and down according to up and down movement of the discharging part or the spraying part, respectively, a valve stem connected to a lower end of the piston, and an elastic member, such as a spring coupled to an outer side of the valve stem to provide a restoring force to the discharging part or the spraying part, respectively, wherein the piston is moved up, when the discharging part or the spraying part, respectively, is moved down, such that the medicament delivered through a discharging passage or a spraying passage, respectively, formed in the valve stem is delivered to the outlet port or the spray hole, respectively, by the predetermined setting amount, and then moved down to prevent movement of the medicament, wherein the discharging part or the spraying part, respectively, includes a head base having an outlet port or a spray hole, respectively, formed at an upper end thereof; a liner installed in a discharging passage or a spraying passage, respectively, formed in the head base and configured to deliver the medicament pumped by up and down movement of the piston to the outlet port or the spray hole, respectively; an elastic member, such as a spring, installed between the liner and the piston or inside a cavity of the liner to provide an elastic force to the piston, and a drop forming means or a vortex forming means, respectively, configured to form a drop so that the medicament delivered to the outlet port is discharged in the form of the drop, or to form a vortex so that the medicament delivered to the spray hole is discharged in the form of a spray, respectively, wherein the sucking part includes a coupling body coupled to an upper end of the container, a housing coupled to a lower portion of the coupling body and having an inlet port which is at a lower portion thereof and through which the medicament stored in the container is introduced, and a check valve coupled to a lower portion of the housing to open and close the inlet port, and first and second control grooves configured to control the amount of the medicament introduced into the housing are formed at an inner surface of the housing. a sucking part coupled to an upper portion of a container to suck a liquid medicament stored in the container; a pumping part coupled to one side of the sucking part to perform a pumping operation, such that the medicament is discharged or sprayed by a predetermined setting amount; an outlet (30, 30') installed at an upper end of the pumping part to release the medicament; a piston moved up and down according to up and down movement of the discharging part or the spraying part, respectively, a valve stem connected to a lower end of the piston, and an elastic member, such as a spring coupled to an outer side of the valve stem to provide a restoring force to the discharging part or the spraying part, respectively, wherein the piston is moved up, when the discharging part or the spraying part, respectively, is moved down, such that the medicament delivered through a discharging passage or a spraying passage, respectively, formed in the valve stem is delivered to the outlet port or the spray hole, respectively, by the predetermined setting amount, and then moved down to prevent movement of the medicament, wherein the discharging part or the spraying part, respectively, includes a head base having an outlet port or a spray hole, respectively, formed at an upper end thereof; a liner installed in a discharging passage or a spraying passage, respectively, formed in the head base and configured to deliver the medicament pumped by up and down movement of the piston to the outlet port or the spray hole, respectively; an elastic member, such as a spring, installed between the liner and the piston or inside a cavity of the liner to provide an elastic force to the piston, and a drop forming means or a vortex forming means, respectively, configured to form a drop so that the medicament delivered to the outlet port is discharged in the form of the drop, or to form a vortex so that the medicament delivered to the spray hole is discharged in the form of a spray, respectively, wherein the sucking part includes a coupling body coupled to an upper end of the container, a housing coupled to a lower portion of the coupling body and having an inlet port which is at a lower portion thereof and through which the medicament stored in the container is introduced, and a check valve coupled to a lower portion of the housing to open and close the inlet port, and first and second control grooves configured to control the amount of the medicament introduced into the housing are formed at an inner surface of the housing.