A covering body for heating a pipe to be attached to the pipe and to conduct external heat to heat the pipe, including: a surrounding body including at least two parts having a divided shape of a cylindrical body along an axial line of the cylindrical body, the surrounding body having: a through hole having a diameter corresponding to an outer diameter of the pipe; and a concave groove provided on an outer peripheral surface of at least one of the at least two parts and extending in a longitudinal direction of the surrounding body, a fitting member including: a first fitting plate including a first arc band-shaped plate longer than a half of circumference of an outer peripheral surface of the surrounding body and having a first extended portion and a first cutout at one end of the first arc band-shaped plate; a second fitting plate including a second arc band-shaped plate longer than the half of circumference of the outer peripheral surface of the surrounding body and having, at one end of the second arc band-shaped plate, a second extended portion and a second cutout to be engaged with the first cutout and the first extended portion; and a hinge openably and closably combining the other ends of the first arc band-shaped plate and the second arc band-shaped plate each other, the fitting member being attached on the surrounding body so as to fit the hinge in the concave groove and fit the first extended portion to the second cutout.