The branch museum is housed in an old Spanish building that used to be a library and Municipal Trial Court of Boac, Marinduque. Representative and now Governor Carmencita Reyes, who facilitated the restoration of the building and construction of showcases, made possible the turnover of the lot and building to the National Museum by the municipality of Boac. The museum measures 410 square meters including the mezzanine floor.

Boac, dubbed as a small paradise, is the capital town. The Boac branch museum was formally opened to the public on February 22, 1995.

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Kalutang is an early type of musical instrument in Marinduque that is composed of graduated sets of softwood bars played with pieces of sticks. This instrument is used during special events and celebrations.

Morion Masks are made of woodand are elaborately adornedwith colorful shells, tassels, and crepe papers. These masks, togetherwith colored vests, capes, and wooden shields, are worn byindividuals who act as Roman soldiers during the MorionesFestival. The Moriones is a Lenten tradition inMarinduque that centers on Longinus, the one-eyed Roman centurion who got back his full sight when blood ofthe crucified Jesus spurted into his blind eye.