Button mechanism and alarm

The utility model belongs to the field of security and protection, and provides a button mechanism and an alarm, the button mechanism is arranged on an alarm shell, the button mechanism comprises a pressing structure, and the pressing structure is uniformly provided with a trigger part, a plurality of first connecting parts and a plurality of contact surfaces; the supporting structure is formed on the upper surface of the shell, and the supporting structure comprises a plurality of second connecting parts and a plurality of elastic parts which are uniformly arranged; each first connecting part is movably connected with one corresponding second connecting part along the axial direction of the pressing structure; and each contact surface is elastically propped against one corresponding elastic part. According to the button mechanism provided by the utility model, the first connecting part and the second connecting part as well as the contact surface and the elastic part are uniformly arranged and correspondingl