To evaluate the long-term safety and efficacy of TS-152 in subjects with Rheumatoid Arthritis who have completed the previous study (TS152-3000-JA study or TS152-3001-JA study).

Inclusion Criteria:

1. At visit1(-4 weeks), Subject must be fully informed about the study and must obtain written informed consent from the subject himself.
2. At Visit2(0 week), Subjects must have completed the previous study (TS152-3000-JA or TS152-3001-JA) ,and must have completed all evaluations required at the follow-up visit.

etc.

Exclusion Criteria:

1. Subjects who had serious adverse drug reactions in the previous study.
2. At Visit1(-4 weeks) or Visit2 (0 week), Subjects who have not recovered from clinically important adverse events.

etc.