The Bi‐based oxide superconducting tapes containing high‐Tc(Tc=110 K) and low‐Tc(Tc=85 K) phases were prepared by the powder metallurgy method using an Ag sheath, andJcwas measured at 77 and 4.2 K in magnetic fields up to 30 T. A grain‐oriented microstructure with thecaxes perpendicular to the tape surface was obtained for the tapes with a high‐Tcphase by applying a combination of cold rolling and sintering.Jcof the high‐Tctape was significantly improved by this grain orientation. However, large anisotropy inJcwith respect to the magnetic field direction was observed for these textured tapes. For the low‐Tctapes, it was difficult to obtain a grain‐oriented microstructure by the cold rolling and sintering process. However,Jcat 4.2 K of the nontextured low‐Tctape is as high as that of the grain‐oriented high‐Tctape. TypicalJcvalues at 4.2 K were above 104A/cm2at 12 T for both high‐ and low‐Tctapes.Jcat 4.2 K of the Bi‐based tapes is much less sensitive to the magnetic field than the conventional metallic superconductors, which indicates that the Bi‐based oxide is a good candidate for the high‐field superconducting magnet.