The present invention relates to a transparent solid cleaning agent that is convenient to carry because it has solid pen shape, and has no concern of contents flowing because it is a solid. According to one aspect of the invention, a transparent solid cleaning agent comprising 10 to 70 wt % of gel forming material including alkali metal salt or ammonium salt of C8-36 aliphatic carboxylic acid, 2 to 30 wt % of a transparency agent, 2 to 30 wt % of a subsidiary transparency agent, 0.1 to 10 wt % of orange oil, and 0.5 to 20 wt % of anionic surfactant is provided. The transparent solid cleaning agent according to the present invention is convenient to carry because it has a solid pen shape, has no concern of contents flowing because it is a solid, prevents collapse or bending, and has an excellent sense of beauty because the contents are transparent.