The present invention provides a novel fluorescent protein.A novel protein includes the following protein (F1):(F1) a protein consisting of an amino acid sequence of SEQ ID NO: 1, whereinin the amino acid sequence of SEQ ID NO: 1,a 52nd amino acid Xaa52 is an arbitrary amino acid,a 133rd amino acid Xaa133 is an arbitrary amino acid, anda 154th amino acid Xaa154 is an arbitrary amino acid.