Titanium-based composite material, its manufacturing method and engine valve

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A titanium-based composite material according to the present invention is characterized in that it comprises : a matrix containing a titanium (Ti) alloy as a major component, and titanium compound particles and/or rare-earth element compound particles dispersed in the matrix, wherein the matrix contains 3.0-7.0% by weight of aluminum (Al), 2.0-6.0% by weight of tin (Sn), 2.0-6.0% by weight of zirconium (Zr), 0.1-0.4% by weight of silicon (Si) and 0.1-0.5% by weight of oxygen (O), the titanium compound particles occupy 1-10% by volume, and the rare-earth element compound particles occupy 3% by volume or less. With this arrangement, it is possible to obtain a titanium material, which is good in terms of the heat resistance, hot working property, specific strength, and so on.