[en] RIKEN Heavy Ion Linac, RILAC, has been operating for ten years with use of a PIG ion source and has been used for studies in atomic physics, solid state physics, radiation and nuclear chemistry, and others. It also is used as an injector for RIKEN Ring Cyclotron. To get higher charge-state ion beams and the large number of ion species, we replaced the PIG ion source by an ECR ion source on the 500 kV injector in the last year. We bought the ECR ion source, NEOMAFIOS, from C.E.N.G. in France. This ECR ion source should be an ideal source for RILAC injector because it is compact and it consumes less than 10 kW electric power. With this improvement the maximum energies of ions having a mass number larger than 16 are expected about to be twice as large as previously obtained. The performance of this ECR ion source and the beam acceleration are described. (author)