Mouse

A mouse, comprising:

• a base;
• a cover plate, located on the base and covering the base, and the cover plate being provided with a hole;
• a circuit board, disposed on the base and located between the base and the cover plate;
• a button switch, disposed on the circuit board and extending into the hole;
• an elastic cover, covering the button switch, and extending into the hole together with the button switch, so as to prevent the button switch from being exposed out of the hole;
• and
• an upper cover, covering the cover plate, and the upper cover being capable of oscillating relative to the cover plate to abut against the elastic cover, so as to trigger the button switch, wherein the elastic cover comprises:
• a contact portion, disposed on a top end of the elastic cover, and extending into the hole to contact the upper cover, wherein a first surface of the contact portion contacts the upper cover, and a second surface of the contact portion contacts the button switch;
• a fixing portion, disposed on a bottom of the elastic cover, and configured to contact an upper surface of the circuit board and fix the elastic cover onto the upper surface of the circuit board;
• and
• an extending portion, connected to the contact portion and the fixing portion.