The auxiliary desk for mounting on a desk according to the present invention comprises a main body part having a top and a bottom formed in a flat plate shape, an auxiliary body part coupled to the front of the main body part and having a top and bottom surfaces formed in a flat plate shape, The main body support part being provided on the lower surface of the main body part and supporting the main body part and the auxiliary support member provided on the lower surface of the auxiliary body part and supporting the auxiliary body part, A pivotal fixing member is provided between the main body and the connection body, and a pivotal fixing member is installed between the auxiliary body and the connection body. And the main body portion and the connection body portion are configured to be rotatable with respect to each other via a pivotal fixing member The main body portion and the auxiliary body portion are configured to be rotatable with respect to each other, and the main body portion and the connection main body portion are rotatable with respect to each other via a rotation fixing member, And a supporting member for supporting the object placed on the body portion is provided.;
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