The present invention relates to a contents dispensing pump used by being mounted in a container so as to dispense, to the outside, contents accommodated in the container by a fixed quantity through a pumping operation and use the same, and particularly, to a contents dispensing pump which can: increase productivity and lower a product price by allowing a deformed pressing member to function as a cylinder and an opening and closing valve so as to simplify a structure of the contents dispensing pump; and at the same time, be easily mounted in a product having a small space in which the dispensing pump is to be mounted, by performing a pumping operation by changing the volume of a temporary contents reservoir due to a deformation of the deformed pressing member such that a working stroke distance of the dispensing pump can be short. To this end, the present invention relates to the contents dispensing pump which is coupled to a container for accommodating the contents therein and dispenses the contents, wherein a deformed pressing member (60) descends by being pressed and deformed when a push button (50) descends such that the volume of a temporary reservoir (TR) is reduced and pressure is generated in the temporary reservoir (TR). Thus, a valve plate (40) closes a contents outlet (242), and a valve protrusion wheel (62) coming into close contact with a contents opening and closing piece (513) is widened by the pressure such that the contents contained in the temporary reservoir (TR) are dispensed through an outlet (51) by passing through a gap between the contents opening and closing piece (513) and the valve protrusion wheel (62). Then, when the pressure that presses the push button (50) is removed, the push button (50) lifts up by a restoring force of en elastic member (70) such that the deformed pressing member (60) pressed by the push button (50) is restored to the original state. Thus, the pressure generated within the temporary reservoir (TR) disappears and vacuum pressure is generated, so that the gap between the contents opening and closing piece (513) and the valve protrusion wheel (62) of the deformed pressing member (60) is closed and the central part of the valve plate (40) is lifted by the vacuum pressure so as to widen boundary lines of opening and closing lines (41). Thus, the contents contained in the container (10) move to the temporary reservoir (TR) through a gap between the valve plate (40) and the contents outlet (242), and in this case, the contents that have passed through the contents outlet (242) move to the temporary reservoir (TR) through gaps of the widened opening and closing lines (41) of the valve plate (40). When the vacuum pressure of the temporary reservoir (TR) disappears according to the movement of the contents, the opening and closing lines (41) widened due to the autonomous elastic power of the valve plate (50) are restored, to an original state and are closed such that the valve plate (40) closes the contents outlet (242). Furthermore, the contents dispensing pump which is coupled to a container for accommodating the contents therein and dispenses the contents, according to a first embodiment of the present invention, comprises a valve body (20), the valve plate (40), the push button (50), the deformed pressing member (60), and the elastic member (70), and the valve body (20) comprises a valve upper body (22) and a valve lower body (24), wherein: the valve upper body (22) has a mounting sill (222) on the upper side thereof, and has a valve plate support end (224) protruded from the middle part of the inner side thereof; and the valve lower body (24) has the contents outlet (242) in the center thereof, and has a ring-shaped protrusion (244) in the vicinity of the outer side of the contents outlet (242), wherein the valve lower body (24) is coupled to the valve upper body (22). The valve plate (40) is coupled between the valve upper body (22) and the valve lower body (24) of the valve body (20), and the plurality of opening and closing lines (41) are formed. The push button (50) is coupled to the outer periphery portion of the valve upper body (22), has the outlet (51) from which the contents are dispensed in the center thereof, and has a plurality of ribs (511) inside the outlet (51) so as to integrally connect and form the contents opening and closing parts (513) on the lower end thereof. The deformed pressing member (60) is coupled to the inside of the push button (50), has a coupling sill (64) protruded to the outer periphery thereof so as to be mounted in the mounting sill (222) of the valve upper body (22), and has the valve protrusion wheel (62) in the center thereof. The elastic member (70) is positioned over the coupling sill (64) of the deformed pressing member (60) so as to press and fix the coupling sill (64) of the deformed pressing member (60) to the mounting sill (222) of the valve upper body (22), thereby increasing airtightness and at the same time, elastically supporting the push button (50).