A probe is provided with a rod-shaped plunger (11) including a distal end portion (111) and an insertion portion (112) coupled to the distal end portion (111); a tube-shaped barrel (12) inside which the insertion portion (112) of the plunger (11) is disposed; and an electrically conductive first securing member (131) which is disposed in a region opposing the plunger (11) and the barrel (12) to secure the plunger (11) and the barrel (12), and which has a melting point lower than the materials of both the plunger (11) and the barrel (12); wherein, in a cross section of a region in which the plunger (11) and the barrel (12) overlap, including the region in which the first securing member (131) is disposed, a space between the plunger (11) and the barrel (12) is filled without a gap by the first securing member (131).