PURPOSE: To obtain the inexpensive phosphor bronze excellent in bendability, in phosphor bronze contg. each prescribed amt. of Sn, P and Ni, by annealing it so that the range of the grain size in the crystalline grains is regulated to a specified one in a prescribed temp. range and Ni and P are precipitated as an intermetallic compound.

CONSTITUTION: Phosphor bronze contg., by weight, 0.5 to <3.5% Sn, 0.001 to 0.30% P, 0.001 to 0.50% Ni and the balance Cu with inevitable impurities is manufactured under the following conditions. Namely, at the time when the crystal grains of the phosphor bronze grow to 0.001 to 0.025mm in the temp. range of 150 to 650°C, cold rolling is executed at ≤90% draft. In this way, the high strength phosphor bronze excellent in bendability can be obtd. Thus, the phosphor bronze can correspond to the miniaturization and thinning of electronic parts in an inexpensive manner.