A rear projection type liquid crystal project device comprising a light source, an image source for generating an image using light emitted from the light source, and a projection lens unit for projecting an image light generated from the image source on a screen. The lens unit,;A first optical lens group sequentially arranged to focus the image light incident on the image source side; An optical axis conversion prism for converting the optical axis of the image light passing through the first optical lens group at a predetermined angle, the optical axis having a light incident surface and a light exit surface; Disclosed is a rear projection type liquid crystal projector device including a second optical lens group for focusing and projecting image light whose optical axis is converted by the optical axis conversion prism on the screen.
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