The present invention provides a glass paste for protection coating. The glass paste does not contain lead basically, and can be sintered under low temperature specially under the temperatures below 700 DEG C, also the air-tightness and chemistry endurance, especially acid resistance are excellent. Laser trimming can be easily carried out without damaging resistance stability when glass paste is used as precoated layer glass of thick film resistance element. A glass paste for protection coating has a character that said low melting point glass does not contain Pb basically, represented with the mol % of oxide, containing SiO₂: 20 to 50 percents, Al₂O₃: 0.5 to 10 percents, chosen from at least one of BaO and SrO: 5 to 35 percents, ZnO: 5 to 35 percents, TiO₂: 1 to 10 percents, chosen from at least one of Li₂O, Na₂O and K₂O: 1 to 13 percents, B₂O₃: 0 to 20 percents, chosen from at least one of WO₃ and MoO₃: 0 to 5 percents.