Integrated thermocouple sensors are capable of high precision measurement of gapwise temperature distribution inside melts filling in the cavity, however they have such drawbacks as complicated measurement work, difficulty to change the sensor position, and poor sensor durability. In this study, the authors developed a unique measurement mold capable of sweeping the sensor to anywhere along the cavity width direction, with the sensor fixed at both ends of stationary and movable sides. Experiments were then conducted to clarify that the mold enables two-dimensional measurement of temperature distribution by sweeping a single sensor gradually from the center to the side of the cavity. In molding experiments using a rectangular caivty with a thickness of 3mm and PP, it was found that at low injection rate, the closer the sensor moves to the cavity side, the temperature drops more sharply due to cooling effect. On the other hand, at high injection rate, shear heating effect becomes more conspicuous as the sensor moves toward the side, resulting in a sudden increase in the temperature. Such dramatic temperature rise may cause the “ear-flow” phenomena along cavity sides. In addition, this mold was applied to measure gapwaise and two-dimensional melt temperature distributions during the cavity filling process of short-glass-fiber reinforced PP, and also for the first time to measue those during the super-critcal foam injection molding process of PP, which results in characteristic temperature change patterns for each moding process.