(assignment) It is an object of the present invention to provide a tackifier, a point / adhesive composition, an acrylic point / adhesive composition, and an acrylic-based adhesive composition which are free of yellowing or embrittlement of points and adhesives even when exposed to long- And to provide an energy beam curable point and adhesive composition. (Solution) The maximum absorbance A (measurement condition: sample concentration 1 g / dm 3 , cell length 1 cm) in the region of 254 nm or more by the ultraviolet absorption spectrophotometry was 0.15 or less, and was measured by gas chromatography mass spectrometry in the methylated hydrolyzate A rosin ester (A) having a molecular weight of 320 or more and a content of a component of a molecular weight of 314 to 320 is 95% or more of the total amount of components.
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