Provided is a pulse processing device that accelerates signal processing and prevents counting loss. Provided also is a radiation measuring device in which counting loss is prevented and counting capacity is increased by installing the pulse processing device. The processing device is in a form of a pulse processing device including a pulse detection unit that outputs a linear pulse signal in response to a physical event, a high-speed AD conversion unit that converts the linear pulse signal into digital pulse data, a threshold data setting unit that outputs preset threshold data, a peak value data detection unit that compares the digital pulse data with the threshold data and outputs the maximum digital pulse data, from among the digital pulse data continuously exceeding the threshold data, as maximum peak value data, and a signal processing unit that inputs the peak value data as a pulse wave height.