According to the present invention, a sugarcane-stalk-sugar-content-related marker linked to a sugarcane quantitative trait is provided. Such marker is a sugarcane-stalk-sugar-content-related marker, which comprises a continuous nucleic acid region existing in a region sandwiched between the nucleotide sequence shown in SEQ ID NO: 1 and the nucleotide sequence shown in SEQ ID NO: 8 or a region sandwiched between the nucleotide sequence shown in SEQ ID NO: 9 and the nucleotide sequence shown in SEQ ID NO: 16.