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The rapid growth of text-to-image diffusion models has raised concerns about their potential misuse in generat- ing harmful or unauthorized contents. To address these issues, several Concept Erasure methods have been pro- posed. However, most of them fail to achieve both robust- ness, i.e., the ability to robustly remove the target concept., and effectiveness, i.e., maintaining image quality. While few recent techniques successfully achieve these goals for NSFW concepts, none could handle narrow concepts such as copyrighted characters or celebrities. Erasing these nar- row concepts is critical in addressing copyright and legal concerns. However, erasing them is challenging due to their close distances to non-target neighboring concepts, requir- ing finer-grained manipulation. In this paper, we introduce Subspace Mapping (SuMa), a novel method specifically de- signed to achieve both robustness and effectiveness in eas- ing these narrow concepts. SuMa first derives a target sub- space representing the concept to be erased and then neu- tralizes it by mapping it to a reference subspace that mini- mizes the distance between the two. This mapping ensures the target concept is robustly erased while preserving im- age quality. We conduct extensive experiments with SuMa across four tasks: subclass erasure, celebrity erasure, artis- tic style erasure, and instance erasure and compare the results with current state-of-the-art methods. Our method achieves image quality comparable to approaches focused on effectiveness, while also yielding results that are on par with methods targeting completeness.