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We name the Printable Electrochemistry for the development field of printable electrochemical devices [1,2]. Recently, we focus on several paper-based fully-printable electrochemical devices such as biofuel cell [3], biosensor [4] and reference electrode [5].  Paper-based biofuel cell have been attracted as a potential application as energy harvesting power sources in Internet of things (IoT) field [6,7]. In the present study, we newly developed paper-based wearable biofuel cell array fabricated by screen-printing.  Figure 1 shows a schematic illustration of one of our wearable biofuel cell array. The paper-based biofuel cell array exhibited a maximum power density of 1 mW. The present flexible paper-based biofuel cell is highly applicable to the development of low cost, flexible, ubiquitous energy devices. In the present study, we discuss the characteristics of the wearable biofuel cells in detail. [1] I. Shitanda et al., Electrochim. Acta 54 (2009) 4933. [2] I. Shitanda et al., Sens. Actu. B: Chem. 160 (2011) 1606. [3] I. Shitanda et al., Chem. Commun. 49 (2013) 11110. [4] I. Shitanda et al., Chem. Lett. 42 (2013) 1369. [5] I.Shitanda et al., Analyst, 140 (2015) 6481. [6] Claudia W. Narváez Villarrubia et al., Electrochem. Commun, 45 (2014) 44. [7] Carolin Lau et al., Int. J. Hydrogen. Energy, 42 (2015) 14661. Figure 1