Details of a newly developed dynamic creep testing machine are presented. It has been designed to conduct research into dynamic creep and rupture properties of materials at elevated temperatures under the axial load ranging from the static tensile to the perfectly reversed alternating load.This machine is of the type that applies the static load to the specimen with a pair of coil springs and the alternating load with rotating eccentric masses. The capacity of the machine is as follows:Maximum static load 1tonMaximum alternating load ±1tonAlternating speed 1800-5600cpmMaximum test temperature 800°CThe static load is maintained constant automatically with microswitch and relay mechanism so that it is not influenced by the creep of specimen. The load (magnitude and wave form) can be observed in the cource of tests by means of a load measuring apparatus constructed with wire strain gauges. The specimens are heated by electric furnace and the temperature is controlled to be within ±1°C by an automatic temperature controller. As the measuring apparatus of elongation of specimen is used the combination of dial gauge and dash-pot.Fatigue tests at a room temperature and dynamic creep tests at an elevated temperature (450°C) were made with regard to low carbon steel, using these apparatuses, and some of the results are presented.