and a pair of short sides 12 b and 13 b respectively though not shown a whole or a part of the cloth clamping surface of the long sides 12 a and 13 a are arranged in an upward inclined surface inclined inward to the embroidery frame 10 also an engagement recess 23 a is formed in the substantial lengthwise center of the short side 12 b of the outer frame 12 and a protrusion 31 a is formed in the substantial lengthwise center of the short side 13 b furthermore though not shown a plurality of inner frame receiving portions similar to the inner frame receiving portions 24 a are formed on the long side 12 a of the outer frame 12 the same operational effect obtained in the first embodiment can be achieved in the above construction as well the present invention is not limited to the above described embodiments but can be transformed for example as follows a plurality of inner frame receiving portions may be provided on the entire range of the inner periphery of the outer frame spaced apart in predetermined intervals the present invention is not limited to a substantially elliptic form and a substantially oblong embroidery frame but can also be applied to a circular embroidery frame in such a case it is preferable to arrange each of the cloth clamping.