A 64-year-old woman who felt something wrong around the navel was found having a mass lesion in the pancreatic body. Computed tomography (CT) only revealed an enhanced marginal lesim in the delayed phase. Magnetic resonance imaging (MRI) showed slightly high signal in T1-weighted image and low signal in T2-weighted image. Positron-emission tomography (PET) and studies on tumor markers gave negative findings. Endoscopic ultrasound-guided fine-needle aspiration (EUS-FNA) also revealed no recognizable tumor cells. Based on these findings, we diagnosed the case as solid pseudopapillary tumor and made operative procedure. During surgery, the mass was found in the tissue at where the pancreas was adjacent to the splenic artery, and it was uncertain if the primary focus was in the pancreas. The resected specimen pathologically showed that spindle-shaped cells were growing, nuclear atypism was low, and no pancreatic tissue was found. In addition, Bcl-2 and CD34 were positive in immunostaining. According intraperitoneal solitary fibrous tumor was diagnosed.