PROBLEM TO BE SOLVED: To provide a technique by which a high sugar content tomato can be obtained more easily. SOLUTION: The tomato rootstock has a spillage amount of 80% or less of the spillage amount when grafted with a tomato scion, relative to the spillage amount when the tomato scion plant is root-cultivated. [Selection diagram] None【課題】より簡便に高糖度トマトを得ることができる技術を提供すること。【解決手段】トマト穂木と接ぎ木した場合の溢泌液量が、前記トマト穂木の植物を自根栽培した場合の溢泌液量に対して80%以下である、トマト用台木。【選択図】なし