A root-knot nematode-resistant tomato plant showing dominant root-knot nematode resistance, a root-knot nematode-resistant gene locus of dominant root-knot nematode, and a novel root-knot nematode-resistant tomato plant which does not depend on the temperature conditions of the growing environment. A method for producing a resistant tomato plant, and a screening method for a root-knot nematode-resistant tomato plant. The root-knot nematode-resistant tomato plant of the present invention has a root-knot nematode-resistant gene locus on the fourth chromosome. The root-knot nematode resistance gene locus can be specified by, for example, solcap_snp_sl_21346, solcap_snp_sl_21364, TK43, YU06, YK66, TY38, AR02, HT12, solcap_snp_sl_64250, solcap_snp_sl_21383, solcap_snp_sl_21385 and solcap_snp_sl_21390. By crossing the root-knot nematode-resistant tomato plant of the present invention with another tomato plant, a later tomato plant variety with root-knot nematode resistance can be obtained.
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