Glow plug and manufacturing method thereof

[Object] To provide a glow plug such that corrosion of connecting surfaces of a conductive member and a terminal member is suppressed, and a method for manufacturing the same. [Means for Solution] A glow plug 1 is provided with: a heater 2; a tubular main metal shell 4 with a shaft hole 43; a conductive member 3 extending in the shaft hole 43 of the main metal shell 4 toward a rear end side GK in an axial direction HJ; a metal terminal member 5 with one part 55 positioned in the shaft hole 43 and another part 56 protruding from a rear end 48 of the main metal shell 4 toward the rear end GK in the axial direction HJ, the terminal member 5 including an enclosing portion 51 opened toward a front end side GS in the axial direction HJ, the enclosing portion 51 housing a rear end portion 32 of the conductive member 3 and having electrical continuity with the rear end portion 32, the terminal member 5 being disposed in the shaft hole 43 while spaced apart from an inner peripheral surface 43m of the main metal shell 4 forming the shaft hole 43; and a sealing member 7 made of an insulator and airtightly sealing and insulating between the inner peripheral surface 43m and the terminal member 5 in the shaft hole 43.