A compressor comprising an accumulator and a suction valve assembly, the suction valve assembly comprising: a body part having a horizontal pipe connected to a compression chamber of the compressor; a vertical pipe connected vertically to the horizontal pipe, an end of the vertical pipe being connected to the accumulator; a protruding pipe provided under the vertical pipe by being protruded in a direction contrary to a direction of the vertical pipe relative to the horizontal pipe, an upper surface of the protruding pipe being open; and a lifting/lowering valve provided in a connection portion between the horizontal pipe and the vertical pipe constituting the body part, being a pipe body, a top surface of which is closed, and a circumferential surface of which includes one or more communicating holes provided thereon, each of the one or more communicating holes communicating with an inner part of the horizontal pipe, wherein the lifting/lowering valve is provided such that lifting and lowering movements thereof are guided by the protruding pipe while at least a portion of the lifting/lowering valve is positioned in the protruding pipe, wherein when the compressor operates, the lifting/lowering valve is moved downward by weight so as to open the connection portion, and when the operation of the compressor stops, the lifting/lowering valve is moved upward by pressure difference between an inner part of the accumulator and an inner part of the compression chamber so as to close the connection portion, wherein the one or more communicating holes are provided along a circumference of the upper portion of the lifting/lowering valve, and at least a portion of the communication holes is positioned to communicate with an inner part of the horizontal pipe when the lifting/lowering valve is moved upward and downward. a body part having a horizontal pipe connected to a compression chamber of the compressor; a vertical pipe connected vertically to the horizontal pipe, an end of the vertical pipe being connected to the accumulator; a protruding pipe provided under the vertical pipe by being protruded in a direction contrary to a direction of the vertical pipe relative to the horizontal pipe, an upper surface of the protruding pipe being open; and a lifting/lowering valve provided in a connection portion between the horizontal pipe and the vertical pipe constituting the body part, being a pipe body, a top surface of which is closed, and a circumferential surface of which includes one or more communicating holes provided thereon, each of the one or more communicating holes communicating with an inner part of the horizontal pipe, wherein the lifting/lowering valve is provided such that lifting and lowering movements thereof are guided by the protruding pipe while at least a portion of the lifting/lowering valve is positioned in the protruding pipe, wherein when the compressor operates, the lifting/lowering valve is moved downward by weight so as to open the connection portion, and when the operation of the compressor stops, the lifting/lowering valve is moved upward by pressure difference between an inner part of the accumulator and an inner part of the compression chamber so as to close the connection portion, wherein the one or more communicating holes are provided along a circumference of the upper portion of the lifting/lowering valve, and at least a portion of the communication holes is positioned to communicate with an inner part of the horizontal pipe when the lifting/lowering valve is moved upward and downward.