Pellicle frame and pellicle

A method for manufacturing a pellicle frame, comprising:

• a first step for obtaining an aluminum alloy plastic worked by subjecting an aluminum alloy ingot which contains 5.0 to 10.0% by weight of Ca with the remainder aluminum and inevitable impurities, and has a volume ratio of an Al4Ca phase which is a dispersed phase of 25% or more to a plastic working,
• a second step for subjecting the aluminum alloy plastic worked to a heat treatment in a temperature range of 100 to 300° C., and
• a third step for subjecting the heat-treated aluminum alloy plastic worked to an anodizing treatment with an alkaline electrolytic solution containing an alkali metal and/or an alkaline earth metal as an electrolyte, or an alkaline electrolytic solution containing at least one organic acid selected from maleic acid, oxalic acid, salicylic acid and citric acid.