A mini USB connector includes an electrical insulating terminal holder including an accommodation chamber and first and second tongue members at a front side relative to the accommodation chamber, a conducting terminal set including multiple conducting terminals mounted in the accommodation chamber and arranged in three sets, and an EMI shielding shell surrounding the electrical insulating terminal holder and the conducting terminals and defining therein a mating chamber that matches with the accommodation chamber, the first tongue member and the second tongue member to constitute first, second and third insertion spaces respectively for the insertion of different types of electronic cards or electrical connectors.