A method using a high pressure vessel of piston‐cylinder type is introduced which is capable of the measurement of the ferromagnetic Curie points of fragile materials such as a sintered ferrite under high pressures. Since a sample is fixed in silicon grease inside the vessel, it is compressed hydrostatically and is protected from breaking by the application of solid pressures. Measurements on Mn‐Zn and Ni‐Zn ferrites show that their Curie points rise with the increase of applied pressures, the rate being nearly +1°C/kbar in both cases.