A portable keyboard is disclosed, by which portability can be enhanced with a simple configuration. The present invention includes a plurality of key assemblies, a body part and a flexible connecting member. When the portable keyboard is carried, a plurality of the key assemblies are rolled up around an outer circumference of the body part in a manner that the flexible connecting member between a plurality of the key assemblies is folded. When the portable keyboard is used, a plurality of the key assemblies are unfolded by being rolled down centering on the body part in a manner that the flexible connecting member between a plurality of the key assemblies is unfolded.