A Ancient Man is believed to be the origin of Indonesian ancestors. Ancient Man or better known as prehistoric humans lived before the writing. Physically the shape of the prehistoric human body up to the human form is now undergoing significant and gradual changes in accordance with a certain period called evolution so it is very interesting to be used as information in a container like an ancient human museum that can convey education and entertainment. The basic problem of the planning and design of this ancient museum's interior design is that the existing museum still does not support the needs of users, and the lack of interesting and efficient ways of delivering information to today's standards. Therefore, additions are needed to the design of the museum that meets the needs of user aspects including the disabled and the elderly, supporting interior elements with collection items and visitors psychological state, a more interactive and directed display system so as to maximize the function of space. The research method used is descriptive qualitative.Based on the analysis results of the study above, the design for this museum carries the theme of "Park of Nature Adventure" with a plot in accordance with the time of ancient human evolution and an emphasis on natural nuances that are expected to increase curiosity and love for nature. Its image is interactive, informative, dynamic, natural with a Contemporary style. The museum also applies the concept of green design, namely the selection of materials and technologies that are environmentally friendly. These things are applied in physical design in the form of interior, colors, shapes, lighting, dispositions, furniture elements so that it is hoped that this museum can provide satisfaction and add insight into the evolution of ancient Indonesian people to visitors.Keywords: Museum, Interior Design, Prehistoric Man, Nature