, officially Miyagi Baseball Stadium, is a baseball stadium located in Miyaginohara Sports Park in Sendai, Miyagi Prefecture, Japan. The 30,508-seat ballpark is owned by the prefecture and operated by Rakuten, which has used it as the home field for the Tohoku Rakuten Golden Eagles of Nippon Professional Baseball (NPB) since 2005. Its symmetrical playing surface is the only natural turf field in the Pacific League (PL). An amusement park named Smile Glico Park is integrated into the stadium's left field seating and features a Ferris wheel. Miyagi Stadium is the third-oldest NPB stadium and the oldest in the PL. It was built in 1950 to host countryside NPB games and amateur baseball. Lights were added to the ballpark in 1973 to accommodate night games and attract more professional games. The Lotte Orions began using the stadium as a semi-home that same year and played five seasons in Sendai until 1977. In 1974, the Orions brought Miyagi Stadium its first postseason games, however Japan Series games were not held in the stadium due to its relatively low capacity. Following Lotte's departure, the ballpark again hosted yearly NPB countryside games and the first of four eventual All-Star games was held in 1992. After the 2004 NPB realignment, Rakuten created a new NPB team to be based in Sendai and renovated Miyagi Stadium in several phases. With Major League Baseball stadiums as inspiration, the field was enlarged and the stadium's concourses were expanded, with seating being updated and capacity increased. In the outfield, two full-LED video boards were erected and the amusement park was built. The exterior of the stadium was also drastically changed. Miyagi Stadium hosted its first Climax Series and Japan Series in 2013, when the Eagles went on to win the championship. Naming rights for the stadium have been sold in three-year increments several times since 2005. Staffing firm Fullcast and Nippon Paper Industries were the first two companies to buy the rights. Since 2014, Rakuten has purchased the stadium's naming rights, using it to promote their Kobo eReader, life insurance, and mobile carrier. The stadium has been named Rakuten Mobile Park Miyagi since 2023. History Prior to the 1949 Japanese professional baseball reorganization, Hyojogawara Stadium in Sendai hosted various countryside Japanese Baseball League games beginning in 1948. However, in October 1949, Miyagi Prefecture began redeveloping a nearby former Imperial Japanese Army training ground into Miyaginohara Sports Park, which