A variable-resistor plate for a liquid level detector includes: a substrate main body that is formed from a material having insulation properties; sliding electrodes that are spaced from each other and are arranged side by side along a slide locus of a slide member, which is displaced relative to the plate in accordance with a liquid surface level, on the substrate main body; a resistor that mutually connects the sliding electrodes to generate electric resistances between the sliding electrodes and that enables the correction of the variations in resistance value among individuals through adjustment of a shape of the resistor on the substrate main body; an adjustment contact part that is formed at at least one sliding electrode and is located to be deviated from the slide locus of the slide member, a measuring part of a measuring device being brought into contact with the adjustment contact part; and a pair of correction contact parts that are formed at a correction electrode, which is provided on the substrate main body, the measuring part being brought into contact with each correction contact part.