A tongue anteriorizer comprising: a handle including a main portion having a handle end; a tongue lifting part including an arc member having a first part end integrally joined to the second end of a connecting part and a second part end, the tongue lifting part being made from a plate-like strip having a uniform thickness and configured such that, in use, the second part end can reach a base of the posterior part of a patient's tongue for hooking the posterior part, lifting the tongue and pulling the tongue anteriorly; and the connecting part including a connecting member having a first end formed with the handle end of the main portion of the handle and a second end formed with the first part end of the arc member, wherein the connecting member is a curve oriented in a direction opposite to a curved direction of the tongue lifting part and the curved length of the connecting member (21, 21D) is less than one-third of the curved length of the arc member (31, 31A, 31B, 31 C, 31D, 31E), wherein a subtense is defined by a line connecting the first part end and the second part end of the arc member and the main portion is configured at a predetermined angle with respect to the subtense, wherein the predetermined angle is individually formed between 60-degrees to 210-degrees for each tongue anteriorizer, and wherein the maximum length of a line from the arc member to the subtense and perpendicular thereto is a length of a line and ratio of the length to the length of the subtense is 1/4 to 1/2, the tongue anteriorizer being characterized in that the handle and tongue lifting part are separable and the connecting part comprises a rail that includes two opposite elongated projections and a groove member that includes a groove shaped complementarily to the rail, wherein the projections are formed on the first end of the connecting part that is formed with the main portion of the handle and the groove is formed on the second end of the connecting part that is formed with the arc member of the tongue lifting part, wherein the projections are formed as a projection element, and wherein the groove is formed as an elongated concave element shaped complementarily to the projection element so that the projection element is configured to be insertable into the concave element to form connect the handle and tongue lifting part. a handle including a main portion having a handle end; a tongue lifting part including an arc member having a first part end integrally joined to the second end of a connecting part and a second part end, the tongue lifting part being made from a plate-like strip having a uniform thickness and configured such that, in use, the second part end can reach a base of the posterior part of a patient's tongue for hooking the posterior part, lifting the tongue and pulling the tongue anteriorly; and the connecting part including a connecting member having a first end formed with the handle end of the main portion of the handle and a second end formed with the first part end of the arc member, wherein the connecting member is a curve oriented in a direction opposite to a curved direction of the tongue lifting part and the curved length of the connecting member (21, 21D) is less than one-third of the curved length of the arc member (31, 31A, 31B, 31 C, 31D, 31E), wherein a subtense is defined by a line connecting the first part end and the second part end of the arc member and the main portion is configured at a predetermined angle with respect to the subtense, wherein the predetermined angle is individually formed between 60-degrees to 210-degrees for each tongue anteriorizer, and wherein the maximum length of a line from the arc member to the subtense and perpendicular thereto is a length of a line and ratio of the length to the length of the subtense is 1/4 to 1/2, the tongue anteriorizer being characterized in that the handle and tongue lifting part are separable and the connecting part comprises a rail that includes two opposite elongated projections and a groove member that includes a groove shaped complementarily to the rail, the handle and tongue lifting part are separable and the connecting part comprises a rail that includes two opposite elongated projections and a groove member that includes a groove shaped complementarily to the rail, wherein the projections are formed on the first end of the connecting part that is formed with the main portion of the handle and the groove is formed on the second end of the connecting part that is formed with the arc member of the tongue lifting part, wherein the projections are formed as a projection element, and wherein the groove is formed as an elongated concave element shaped complementarily to the projection element so that the projection element is configured to be insertable into the concave element to form connect the handle and tongue lifting part.