A dual SIM card tray and an electrical connector device are disclosed. The electrical connector device comprises a tray and a connector module. The dual SIM card tray has a first receiving groove and a second receiving groove, which are positioned at two opposing sides, for respectively loading a mini-SIM card and a micro-SIM card, and has a first window communicated with the first receiving groove and a second window communicated with the second receiving groove. The first window and the second window are arranged in a lengthwise direction of the tray, so that conductive pads of the two SIM cards are exposed toward the same side. The connector module includes first and second connectors and an outer shell.