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1. A head mountable display comprising:
a display unit configured to project image light corresponding to an image signal onto an observing eye which is one of both eyes of an observer; and an attachment configured to attach the display unit to a mounted member to be mounted on a head of the observer, wherein the display unit includes: a main body part accommodating an image light generator configured to generate the image light; an emission part configured to deflect and emit the image light from the image light generator toward the observing eye by a deflection member; and a connection mechanism detachably connecting the main body part and the emission part, wherein the main body part and the emission part are arranged in a first direction, the first direction being a direction intersecting frontward and rearward directions relative to the observer in front of the observer's face when the display unit is mounted on the head of the observer through the attachment, wherein the attachment is configured to hold the display unit to provide the emission part in front of the observing eye when the display unit is mounted on the head of the observer, and wherein the connection mechanism is configured such that the emission part is detached from the main body part when the display unit is mounted on the head of the observer through the attachment and when the emission part comes into contact with a member located in front of the observing eye and thereby protecting the observing eye so that a first external force acts on the emission part.
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