In a Ti–15V–3Cr–3Sn–3Al alloy, the internal structure of {332}⟨113⟩ deformation twins formed by weak rolling at 77 K was studied by means of transmission electron microscopy. {332}⟨113⟩ deformation twins accompany very characteristic dislocation loops attached to the twin/matrix interface in the matrix. Inside the twin, a parallel array of stressinduced ω plates with a single variant are formed. It is considered that such dislocation loops are expelled from the β twin/ω interface into the β matrix during the shrinkage of twins by unloading. Secondary {332}⟨113⟩ twinning occurs in the primary twins by further deformation.