Sonna Rosén was an interior decorator and designer, mainly known for having designed the chair Solfjädern.

Sonna Rosén was born in Stockholm on 27 June 1920. She was the daughter of Anna Persson, née Nilsson and Fritiof Persson, Ph. D. In 1947, she married Nils Arne Rosén, an architect, and they had three children in 1947–1957.

Sonna Rosén was educated at the art academy Konstfackskolan (now Konstfack) in Stockholm and she worked for a time as an interior decorator at Carl-Axel Acking’s office. At the end of the 1940s, she and her husband started their own enterprise on Kungsholmen in Stockholm. During the last years of the 1940s and beginning of the 1950s, Sonna Rosén undertook several decorating and designing assignments directed towards elderly and physically handicapped consumers. That led to among other things her publishing the book Bo bra på gamla da'r: förslag till inredning av hem för gamla in 1952, written by assignment of the Svenska socialvårdsförbundet’s delegation for care of the elderly.

In connection with an interior decoration assignment for a nursing home for the elderly in Vimmerby in 1948, she designed the armchair Solfjädern. The chair gives an impression of lightness, thanks to the gently curved backrest with separate rods that become the armrests. In her design of the chair, Sonna Rosén had the needs of the elderly as her point of departure, and thus she designed a chair that was handy, easy to lift oneself out of and with a lower backrest, since people with reduced movement and a stiff back are not served well by a high backrest. In 1952, Solfjädern was awarded the distinction Good Design by the Museum of Modern Art (MoMA) in New York. During her career, Sonna Rosén also worked with textiles and wallpapers, for among others Svenskt Tenn AB.

Sonna Rosén is represented in the Nationalmuseum’s collections in Stockholm by Solfjädern and the fabric print Spectrum from 1955, and at the Museum of Modern Art in New York by Solfjädern.

Sonna Rosén died on 25 June 2007 in Saltsjöbaden, just before her 87th birthday. She is buried with her husband in Skogsö Cemetery.