The present invention relates to a protection case for a water meter, capable of preventing a heat insulation body from being exposed to the outside and from being damaged or lost. The protection case for a water meter comprises: a protection body having a first accommodation space in a shape of a case wherein a water meter and an on/off valve are installed therein, having a plurality of first hanging units in a vertical direction on each of a front surface, a rear surface, a left surface, and a right surface in the first accommodation space; a cover installed in the upper end of the protection body, and opening and closing the upper part of the protection body; the heat insulation body; an upper stopper; and a lower stopper. In the heat insulation body, a second accommodation space is formed on the lower part of the inside in the case shape accommodated in the protection body, and an inner first protrusion unit of two or more layers is formed on the upper end of the heat insulation body. An upper through hole connected to the second accommodation space is formed in the heat insulation body by being extended from the first protrusion unit to the lower part, and a lower through hole is formed on the both sides of the bottom unit respectively of the second accommodation space in order for an inlet pipe and an outlet pipe of the water supply to be inserted and accommodated into the second accommodation space on the bottom part of the second accommodation space. An entering path is formed in the heat insulation body in order for the lower through holes on both sides to be connected to each other, and a plurality of second hanging units corresponding to the first hanging unit of the protection body in a vertical direction are formed on the front, the rear, the left, and the right surfaces in the heat insulation body. A second protrusion unit is formed on the upper side of the upper stopper to be attached and inserted to correspond to the first protrusion unit of the heat insulation body, and the upper stopper is integrally extended from the second protrusion unit to the lower side to be attached and inserted to correspond to the upper through hole of the heat insulation body. The lower stopper is attached and inserted to the entering path in the lower part of the heat insulation body.

수도미터기 보호통에 있어서, 수도미터기 및 개폐밸브가 내부에 설치되는 케이스 형태로 내부에 제1수용공간이 형성되고, 제1수용공간의 전·후·좌·우 내측면 각각에 수직방향으로 다수의 제1걸림부가 형성되는 보호몸체; 상기 보호몸체의 상단부에 구비되어 보호몸체의 상부를 개폐하는 덮개; 상기 보호몸체의 내부에 수용되는 케이스 형태로 내부의 하부측에 제2수용공간이 형성되며, 상단부측에는 적어도 2단 이상의 내측 제1단턱부가 형성되고, 제1단턱부에서 하부측으로 연장되어 제2수용공간에 연통되는 상부통공이 형성되며, 하부측에는 제2수용공간의 바닥부 상에 수도의 유입관 및 유출관이 제2수용공간에 삽입 수용되도록 하부통공이 제2수용공간의 바닥부 양측에 각각 형성되고, 양 하부통공끼리 연통되도록 진입통로가 형성되며, 전·후·좌·우 외측면 각각에 수직방향으로 보호몸체의 제1걸림부와 상호 대응되는 다수의 제2걸림부가 형성되는 보온몸체; 상기 보온몸체의 제1단턱부에 대응되게 밀착 삽입되도록 상부측에 제2단턱부가 형성되고, 제2단턱부로부터 하부측으로 일체로 연장 형성되어 보온몸체의 상부통공에 대응되게 밀착 삽입되는 상부마개; 상기 보온몸체의 하부측 진입통로에 밀착 삽입되도록 형성되는 하부마개를 포함하여 이루어진다.