A base material for producing a sensor for analysis of a detection target , comprising: a base material ; and a polymer film provided on a surface of the base material , wherein the polymer film includes a concave that receives the detection target , and inside the concave , a group for binding antibody substance and a group for binding signal substance , wherein the group for binding antibody substance is a chelate-forming binding group selected from the group consisting of an amino polycarboxylic acid chelating agent-derived group, a hydroxycarboxylic acid chelating agent-derived group, a deferoxamine-derived group, a deferasirox-derived group, a deferiprone-derived group, and a histidine tag, said amino polycarbocyclic acid being selected from the group consisting of ethylenediaminetetraacetic acid (EDTA), ethylenediaminediacetic acid, hydroxyethylethylenediaminetriacetic acid (HEDTA), dihydroxyethylethylenediaminetetraacetic acid (DHEDDA), nitrilotriacetic acid (NTA), hydroxyethyliminodiacetic acid (HIDA), N-(2-hydroxyethyl) iminodiacetic acid, β-alanine diacetic acid, cyclohexanediaminetetraacetic acid, iminodiacetic acid, N-(2-hydroxyethyl) iminodiacetic acid, diethylenetriaminepentaacetic acid (DTPA), N-(2-hydroxyethyl)ethylenediaminetriacetic acid, glycol ether diamine tetraacetic acid, glutamic acid diacetic acid, aspartic acid diacetic acid, methylglycine diacetic acid, iminodisuccinic acid, serine diacetic acid, hydroxyiminodisuccinic acid, dihydroxyethylglycine, aspartic acid, glutamic acid, and triethylenetetramine-N,N,N',N",N′′′,N′′′-hexaacetic acid, and the group for binding signal substance is a thiol group. a base material ; and a polymer film provided on a surface of the base material , wherein the polymer film includes a concave that receives the detection target , and inside the concave , a group for binding antibody substance and a group for binding signal substance , wherein the group for binding antibody substance is a chelate-forming binding group selected from the group consisting of an amino polycarboxylic acid chelating agent-derived group, a hydroxycarboxylic acid chelating agent-derived group, a deferoxamine-derived group, a deferasirox-derived group, a deferiprone-derived group, and a histidine tag, said amino polycarbocyclic acid being selected from the group consisting of ethylenediaminetetraacetic acid (EDTA), ethylenediaminediacetic acid, hydroxyethylethylenediaminetriacetic acid (HEDTA), dihydroxyethylethylenediaminetetraacetic acid (DHEDDA), nitrilotriacetic acid (NTA), hydroxyethyliminodiacetic acid (HIDA), N-(2-hydroxyethyl) iminodiacetic acid, β-alanine diacetic acid, cyclohexanediaminetetraacetic acid, iminodiacetic acid, N-(2-hydroxyethyl) iminodiacetic acid, diethylenetriaminepentaacetic acid (DTPA), N-(2-hydroxyethyl)ethylenediaminetriacetic acid, glycol ether diamine tetraacetic acid, glutamic acid diacetic acid, aspartic acid diacetic acid, methylglycine diacetic acid, iminodisuccinic acid, serine diacetic acid, hydroxyiminodisuccinic acid, dihydroxyethylglycine, aspartic acid, glutamic acid, and triethylenetetramine-N,N,N',N",N′′′,N′′′-hexaacetic acid, and the group for binding signal substance is a thiol group. <EOS>