In order to improve the fatigue strength with maintaining low Young's modulus of a biomedical β-type titanium alloy, Ti-29Nb-13Ta-4. 6Zr, a short-time aging combined with severe cold rolling was investigated. An ω phase was employed for precipitation strengthening. Because the rolling texture of β phase is formed by the cold rolling, such the ω phase may be preferentially oriented to a direction that is effective for inhibiting the increase in Young's modulus. TNTZ aged at 573 K for 3. 6 ks or 10. 8 ks after cold rolling exhibits high tensile strength and acceptable elongation with relatively low Young's modulus. However, the fatigue strength of TNTZ aged at 573 K for 3. 6 ks is not significantly improved. On the other hand, the fatigue strength of the TNTZ sample aged at 573 K for 10. 8 ks is improved as well as its tensile strength.