To provide a contact, formed in an amorphous state, having better spring properties as compared to conventional one; a method for manufacturing the contact; a connection device including the contact; and a method for manufacturing the connection device.The present invention provides a contact comprising an elastically deforming portion that includes at least one amorphous part. The elastically deforming portion includes an auxiliary elastic member 41 made of, for example, NiP (a P content of 15 atomic percent). In this case, an amorphous phase 50 is predominant in the auxiliary elastic member 41. This enhances spring properties such as a yield stress.