To provide an optical transmission assembly which facilitates improvement in working efficiency of assembly and simplifying manufacture of components, and is also easy to improve dimensional accuracy.

The optical assembly 10 accommodates two or more pieces of optical elements in parallel for converting an electric signal to an optical signal or converting the optical signal to the electric signal, and comprises two or more pieces of filters for wavelength-multiplexing or wavelength-demultiplexing the optical signals of the respective optical elements, and on the top face of a base 1 for accommodating two or more pieces of the above optical elements and two or more pieces of the above filters, Can joining parts 3a to 3d for joining a Can package accommodating each optical element are formed; an optical path is formed along the longitudinal direction; and filter junction parts 5a to 5d for joining the above filters are formed on the above base 1 on both sides of the optical path.

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