A compressor comprising: a case; a driving motor including a stator provided at an inner side of the case and a rotor rotatably provided at an inner side in a radius direction of the stator; a centrifugation space defined inside the case by a downstream side of the driving motor and the case, enabling centrifugation of a compressed refrigerant and a lubricant oil; a discharge pipe provided in the case, discharging the refrigerant inside the centrifugation space to the outside of the case; a rotary shaft rotated by being coupled to the rotor and provided with an oil supply path; a compression portion provided at an upstream side of the driving motor, compressing the refrigerant through rotation of the rotary shaft; wherein the compression portion includes a muffler accommodating the compressed refrigerant discharged from the compression portion, provided to guide the compressed refrigerant to the discharge pipe, and a fixed scroll and an orbiting scroll provided to compress the refrigerant through orbiting movement with respect to the fixed scroll, the compressor being characterised in that it further comprises a pump assembly provided below the rotary shaft, pumping oil by being rotated in a single body with the rotary shaft; and an oil pickup forming an oil supply path between the pump assembly and a low oil space formed inside the case, wherein a shaft support portion in which the rotary shaft is accommodated by passing therethrough is provided at a center of the fixed scroll and includes a first boss protruded toward the low oil space, a pump holder portion recessed toward the driving motor to allow the pump assembly to be arranged therein is formed at a center of the muffler, wherein a shaft support portion in which the rotary shaft is accommodated by passing therethrough is provided at a center of the pump holder portion, and includes a second boss protruded toward the driving motor, and wherein at least a portion of the first boss is inserted into the second boss, and the first boss and the second boss are overlapped with each other. a case; a driving motor including a stator provided at an inner side of the case and a rotor rotatably provided at an inner side in a radius direction of the stator; a centrifugation space defined inside the case by a downstream side of the driving motor and the case, enabling centrifugation of a compressed refrigerant and a lubricant oil; a discharge pipe provided in the case, discharging the refrigerant inside the centrifugation space to the outside of the case; a rotary shaft rotated by being coupled to the rotor and provided with an oil supply path; a compression portion provided at an upstream side of the driving motor, compressing the refrigerant through rotation of the rotary shaft; wherein the compression portion includes a muffler accommodating the compressed refrigerant discharged from the compression portion, provided to guide the compressed refrigerant to the discharge pipe, and a fixed scroll and an orbiting scroll provided to compress the refrigerant through orbiting movement with respect to the fixed scroll, the compressor being characterised in that it further comprises a pump assembly provided below the rotary shaft, pumping oil by being rotated in a single body with the rotary shaft; and an oil pickup forming an oil supply path between the pump assembly and a low oil space formed inside the case, wherein a shaft support portion in which the rotary shaft is accommodated by passing therethrough is provided at a center of the fixed scroll and includes a first boss protruded toward the low oil space, a pump holder portion recessed toward the driving motor to allow the pump assembly to be arranged therein is formed at a center of the muffler, wherein a shaft support portion in which the rotary shaft is accommodated by passing therethrough is provided at a center of the pump holder portion, and includes a second boss protruded toward the driving motor, and wherein at least a portion of the first boss is inserted into the second boss, and the first boss and the second boss are overlapped with each other.