The present invention discloses a micro USB receptacle connector and a micro USB connector plug coupled thereto. A micro USB receptacle connector according to one aspect of the present invention includes: a main receptacle contact formed corresponding to a main plug contact of a plug connector to provide an electrical contact; A sub receptacle contact formed on both sides of the main receptacle contact to provide an electrical contact of an additional module; A receptacle insulator for holding the main receptacle contacts and the sub receptacle contacts; A support plate covering and protecting the receptacle insulator with the contacts held therein; And a receptacle shell surrounding the outside of the receptacle insulator, wherein the sub-receptacle contact is located higher than the main receptacle contact in an upper direction in which the support plate is located, and may have a contact height different from that of the main receptacle contact.
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