Referring to FIG. 2 to FIG. 5, the shielding element 40 is formed by a metal injection molding (MIM) technology. The shielding element 40 surround the insulating housing 10. The shielding element 40 has a base body 41. The base body 41 opens a receiving chamber 46 penetrating through a front surface and a rear surface of the base body 41. The receiving chamber 46 includes a first receiving chamber 411 and a second receiving chamber 413. The base body 41 opens the first receiving chamber 411 passing through a rear surface of the base body 41. A front wall of the first receiving chamber 411 opens the second receiving chamber 413 passing through the front surface of the base body 41. The second receiving chamber 413 is located in front of and communicated with the first receiving chamber 411. Two opposite sides of the front surface of the base body 41 extend frontward to form two side boards 42 spaced from each other. At least one portion of the front surface of the base body 41 protrudes frontward to form at least one sealing board 43 connected with rear ends of the two side boards 42 connecting with the base body 41. An upper portion and a lower portion of the front surface of the base body 41 protrude frontward to form two sealing boards 43 connected with the rear ends of the two side boards 42 connecting with the base body 41.